|
1.5V to 5V Converter - In many cases can be very handy to be able to
convert 1.5V to 5V. Then you can power microcontroller or LED from a
single AA or AAA battery. It is simple to do this as there are special
IC�s as MAXIM MAX1674 or MAX7176. This is step-up DC-DC converter that
can convert voltages from 0.7V to any in range from 2V to 5.5V. MAX1676
have already preset pins for 3.3V and 5V, that makes easer integration
in 3.3 and 5V circuits. IC can dissipate up to 444mW. ….(electronic
schematic) |
|
10W HF Linear Amplifier - (circuit / schematic design) |
|
12 Volt to 9 Volt DC Converter - Car Converter for12 Volt to 9V
(Tony van Roon's electronic design) |
|
122 Volt AC Lamp Dimmer Full Wave SCR - (circuit / schematic design) |
|
123 VAC Lamp Dimmer (full wave SCR) - The full wave phase control
circuit below was found in a RCA power circuits book from 1969. The load
is placed in series with the AC line and the four diodes provide a full
wave rectified voltage to the anode of a SCR. Two small....(electronic
diagram) |
|
12V DC to 220V 100W Inverter with 4047 IC & IRF540 - This is 100W
inverter circuit. It uses 4047 IC and IRF540 Mosfet instead of 2N3055
transistor. Power output is 100W from 2-3A transformer. ….(electronic
schematic) |
|
12V Fluorescent Inverter - Build this 20 watt Fluoro Inverter, it
drives two 20-watt tubes or a 40-watt tube!….(electronic circuit) |
|
12V to 110V/ 220V 500W Inverter - Using this circuit you can
convert the 12V dc in to the 220V Ac. In this circuit 4047 is use to
generate the square wave of 50hz and amplify the current and then
amplify the voltage by using the step transformer. How to calculate
transformer rating The basic formula is P=VI and between input output of
the transformer we have Power input = Power output For example if we
want a 220W output at 220V then we need 1A at the output. Then at the
input we must have at least 18.3V at 12V because: 12V*18.3 = 220v*1 So
you have to wind the step up transformer 12v to 220v but input winding
must be capable to bear 20A. ….(electronic schematic) |
|
12V to 120V Inverter - Have you ever wanted to run a TV, stereo or
other appliance while on the road or camping? Well, this inverter should
solve that problem. It takes 12 VDC and steps it up to 120 VAC. The
wattage depends on which transistors you use for Q1 and Q2, as well as
how "big" a transformer you use for T1. The inverter can be constructed
to supply anywhere from 1 to 1000 (1 KW) watts. ….(circuit design) |
|
12V to 120VAC inverter - (Tony van Roon's schematic) |
|
12V to 220V 100W Inverter - This is a simple 100W inverter that can
be used to achieve 110V or 220V from 12V. Circuit uses 2N3055 output
transistors that are easily available. Output voltage depends on the
type of transformer being used. ….(circuit design) |
|
12W AC-DC Flyback converter - Fully assembled and tested power
supply with DC containing all design documentation Features: Universal
AC line input, 0-1A Iout @ 12V, 84% efficiency at high line, Short
Circuit protection, Over Voltage protection |
|
18v AC to DC Power Supply - This is a classic linear power supply
which produces a regulated 18v, rated at about 1 amp. (designed by David A. Johnson) |
|
240VAC To 5VDC Power Supply - This is simple way to power some 5v
logic from a 240vac source. If a 120vac power adapter is used, the
circuit will also work for 120vac power lines. ….(designed by David A.
Johnson) |
|
3W HF QRP Linear Amplifier - (circuit / schematic design) |
|
500mW HF Linear Amplifier - (circuit / schematic design) |
|
500w HF Linear Amplifier - (circuit / schematic design) |
|
500W Mos-Fet Power Inverter from 12V to 110V/220V - This circuit
will provide a very stable "Square Wave" Output Voltage. Frequency of
operation is determined by a pot and is normally set to 60 Hz. Various
"off the shelf" transformers can be used. Or Custom wind your own FOR
BEST RESULTS. Additional MosFets can be paralleled for higher power. It
is recommended to Have a "Fuse" in the Power Line and to always have a
"Load connected", while power is being applied. The Fuse should be rated
at 32 volts and should be aproximately 10 Amps per 100 watts of output.
The Power leads must be heavy enough wire to handle this High Current
Draw! ….(design) |
|
50V 3A Stabilized Power Supply with 2N3055 - Many times we needed a
stabilized, together regulated power supply and high relatively output
voltage. These specifications him it cover our circuit. It 's a circuit
that can give in his exit + 40V until + 60V 3A, with simultaneous
stabilization. The materials that use is very simple and will not exist
difficulties in the manufacture, is enough you are careful certain
points. 1 ] For output voltages smaller of + 50V until + 40V, the Q1 is
hot enough, so that it needs one big heatsink. ….(design) |
|
6 to 12 Volt Converter (Aaron Cake) - This circuit can provide up to
800mA of12V power from a 6V supply. The circuit is simple, about 75%
efficient and quite useful. |
|
600 Volt Power Supply - simple 600 Volt DC power supply. Convert
230V AC to 300V and 600V DC. |
|
60w Ac-DC Flyback Converter - Universal AC line input Fully
assembled and tested power supply with DC containing all design
documentation Features: 0-4A Iout @ 15V, 87% efficiency at high line,
Short Circuit protection, Over Voltage protection |
|
80V Linear Regulator is Micropower - DN314 Design Notes (Linear
Technology) (app note) |
|
90W AC-DC Flyback converter - Fully assembled and tested power
supply with DC containing all design documentation Features: Universal
AC line input, 0-6A Iout @ 15V, 83% efficiency at high line, Short
Circuit protection, Over Voltage protection |
|
AN-1148: Linear Regulators: Theory of Operation & Compensation -
National Semiconductor Application Note (app note) |
|
AN-262: Low-Noise Low Drop-Out Regulator for Portable Equipment -
AN-262 Analog Devices Application Note (app note) |
|
AN-60-004 Ultra-Linear 50W Amplifiers 20-512MHz LZY-1 - Application
Note MiniCircuits.com (app note) |
|
AN-60-005 Ultra-Linear 32W Amplifiers 500-1000MHz LZY-2 -
Application Note MiniCircuits.com (app note) |
|
AN-60-009 High IP3, wide band, balanced linear power Amplifier HELA-10
- Application Note MiniCircuits.com (app note) |
|
AN-D10: Off-Line Compact Universal Linear Regulator - Supertex
Semiconductors (app note) |
|
AN-D14: LP07 Series: Low Dropout 3.0 Volt Linear Regulator -
Supertex Semiconductors (app note) |
|
AN-H22: Customizing the Linear Circuitry Response of HV91 - Supertex
Semiconductors (app note) |
|
AN-H40: High Voltage Linear Regulator & Constant Current - Supertex
Semiconductors (app note) |
|
Apex-AN35 PWM AC/DC Power Supply Design - 12/1999, AN35UREVA :
332 Kb (Apex App Note) |
|
Automobile Interior Light Fader - This circuit is similar to the
fading eyes circuit above and is used to slowly brighten and fade
interior lights of older cars. The circuit is based around the LM324 low
power opamp which draws around 3mA of current, so it won't bother the
battery if left connected for extended periods....(circuits) |
|
Bidirectionall power inverter - 08/02/01 EDN-Design Ideas: If you
want to swap charge in either direction between unevenly loaded positive
and negative battery buses, you need an inverting dc transformer. One
implementation is the symmetrical flyback converter shown in Figure 1.
The circuit can generate a negative output.....(design idea) |
|
Caps Provide Voltage Boost To Series Regulator - This circuit adds
some capacitors and diodes to a traditional transformer type series
regulator circuit to extend the normal operating range. It can insure
regulation during low line voltage conditions or it can squeeze a few
more watts out of a plug-in-the-wall power adapter power supply.
….(designed by David A. Johnson) |
|
Circuit Forms Constant Current SCR - 02/01/01 EDN-Design
Ideas:.....(design idea) |
|
Circuit offers improved active rectification - 02/06/03 EDN-Design
Ideas: Rectifiers convert ac signals to dc. You can combine a diode and
a load resistor to create a half-wave rectifier, provided that the
amplitude of the ac source is much larger than the forward drop of the
diode (typically 0.6V). Unfortunately, you can't use this method to
rectify signals that are smaller than a diode drop.....(design idea) |
| Classic Plus & Minus DC Power Supply -
This is a classic example of a regulated DC power supply that produces
both a positive 15v and a negative 15v from a 20vac wall adapter.
….(designed by David A. Johnson) |
|
CMOS hex inverter generates Low distortion sine waves - 06/09/05
EDN-Design Ideas: Audio signal source uses hex inverter and handful of
passives.....(design idea) |
|
CMOS inverters convert RF to Digital signal - 01/05/06 EDN-Design
Ideas: Hex-inverter-based design suits frequencies up to180
MHz.....(design idea) |
|
Customizing the Linear Circuitry Response of HV91 - Supertex
Semiconductors (app note) |
|
DC to DC Converter - The circuit below is a DC to DC converter using
a standard 12 VAC center tapped power transformer wired as a blocking
oscillator. The circuit is not very efficient but will produce a high
voltage usable for low power applications. The input battery voltage is
raised by a factor of 10 across the transformer and further raised by a
voltage tripler consisting of three capacitors and diodes connected to
the high voltage side of the transformer.....(circuit) |
|
EPR-32: 25 Watt Multiple Output TOP245P Supply - This design kit is
an AC-DC power supply with universal input and 4 outputs. The design,
rated for 20 W (25 W peak), is implemented using a TOP245P device from
the TOPSwitch-GX IC family and an EEL25 core in a flyback topology. |
|
Fast Rectifier Circumvents Input Level Effects - 12/22/94 EDN-Design
Ideas: All diode-based rectifier circuits suffer from a
signal-level-dependent frequency response. This response occurs because
the dynamic impedance of the diodes varies as the signal level changes.
The result is a slower frequency response and distorted rectified
outputs at low signal levels compared with high levels. An alternative
approach.....(design idea) |
|
Full wave rectifier operates to 200 MHz - 07/20/95 EDN-Design Ideas:
The circuit in Figure 1 uses current-feedback amplifiers to implement a
wideband full-wave rectifier for applications such as a control/AGC
system reference or as an amplitude indicator. Putting the
full-wave-rectifier diodes in the feedback loop of an op amp works
better than does using simple diode-based rectifiers. The op amp's loop
gain.....(design idea) |
|
High Efficiency Linear & Switching Solutions for Splitting a Digital
Supply - DN172 Design Notes (Linear Technology) (app note) |
|
High Efficiency Linear Regulators - AN32 Linear Technology Presents
circuit techniques permitting high efficiency to be obtained with linear
regulation. Particular attention is given to the problem of maintaining
high efficiency with widely varying inputs, outputs and loading.
Appendix sections review component characteristics and measurement
methods. |
|
High IP3, wide band, balanced linear power Amplifier HELA-10 -
AN-60-009 Application Note MiniCircuits.com (app note) |
|
High Speed Rectifier uses No Diodes - 03/03/03/95 EDN-Design Ideas:
Fig 1 shows a high-speed, full-wave rectifier-or absolute-value
circuit-that uses a high-speed clamping amplifier, IC2. This circuit is
faster and performs better than rectifiers employing diodes in their
amplifiers' feedback paths. These diode-based circuits have limitations
at lower signal-input levels and higher bandwidths. These
limitations.....(design idea) |
|
High Voltage Linear Regulator & Constant Current - Supertex
Semiconductors (app note) |
|
Introduction to Schottky Rectifiers - MicroNote 401 from Microsem
(app note) |
|
LB-8: Precision AC/DC Converters - National Semiconductor
Application Note (app note) |
|
Linear regulator=Low cost DC/DC converter - 06/13/02 EDN-Design
Ideas: The circuit in Figure 1 is a good choice if you need a power
supply with high efficiency and you don't want to use expensive
dc/dc-converter ICs. The heart of the circuit is IC1, the common,
inexpensive LM7805 linear regulator. The external switch is a pnp
transistor; the circuit can easily source more than 1A output
current.....(design idea) |
|
Linear Regulators: Theory of Operation & Compensation - National
Semiconductor Application Note (app note) |
|
Low Power 12,000 Volt Power Supply - If you need about 12,000 volts
DC for an ion generator this circuit might be the ticket. It draws power
from the 120vac power line but it uses a small 6KV camera flash trigger
coil. The output signal is isolated from the power line. Although the
circuit can only deliver about 5uA of current it can produce dangerous
shocks, so be careful. ….(designed by David A. Johnson) |
|
Low-Noise Low Drop-Out Regulator for Portable Equipment - AN-262
Analog Devices Application Note (app note) |
|
LP07 Series: Low Dropout 3.0 Volt Linear Regulator - Supertex
Semiconductors (app note) |
|
Miniature Isolated AC/DC Power Supply - This circuit uses a novel
approach to produce a fully isolated and regulated 5 volts @30ma from
the 120vac power line. It uses two tiny SCRs that alternately discharge
two capacitors through a miniature high frequency transformer. The
voltage spikes produced through the transformer are rectified, filtered
and regulated. A very common 8 ohm audio impedance matching transformer
can be used for the transformer. Published in EDN, Feb. 17, 1992
….(designed by David A. Johnson) |
|
MOSFET Switch Provides Efficient AC/DC Conversion - 02/17/00
EDN-Design Ideas:.....(design idea) |
|
Motor Accu Lader (Dutch language) - (circuit design) |
|
Non-isolated Off-line AC to DC Power Supply - This compact efficient
circuit can provide up to 100ma of a regulated 5 volts from an AC power
source ranging from 20vac to 120vac. ….(designed by David A. Johnson) |
|
Off-Line Compact Universal Linear Regulator - Supertex
Semiconductors (app note) |
|
Off-Line Power Supply Does Not Require Filtering to Meet FCC Emission
Requirements - DN175 Design Notes (Linear Technology) (app note) |
|
One 9 Volt Battery gives +18 +25 +33V - This circuit is based on
MAX1044 is a charge pump converter. |
|
One Watt 2.45 GHz Linear Amplifier - (circuit / schematic design) |
|
OpAmp Rectifier Signals Input State - 07/21/94 EDN-Design Ideas: The
op-amp rectifier in Fig 1 operates from a single supply and provides a
logic output and an LED that indicate the state of the input voltage.
The input-state indications are handy for calibration. Because the
circuit operates from a single supply, the 2.5V reference determines the
level around which the circuit rectifies input waveforms.....(design
idea) |
|
Output Adjustable Flyback Converter - (electronic diagram) |
|
Precision AC/DC Converters - National Semiconductor Application
Notes,28-Jun-1996 (app note) |
|
Precision full wave Signal rectifier needs no diodes - 09/01/05
EDN-Design Ideas: Single-supply design uses two op amps.....(design idea) |
|
Precision Rectifier is Glitch Free to 1 MHz - 05/12/94 EDN-Design
Ideas: The manufacturer’s circuit for a precision, current-mode,
full-wave rectifier (Fig 1a)converts a voltage signal to a current,
eliminating errors arising from voltage drops across the rectifying
diodes. However, just like op-amp-based rectifiers, the circuit
i.....(design idea) |
|
Precision Rectifier Reduces Ripples - 03/03/97 EDN-Design Ideas: You
can use a lowpass filter to simultaneously increase a rectifier's speed
and reduce or maintain the ripple voltage. The input voltage of the
precision rectifier in Figure 1a is 100 mV at a frequency of 50 Hz. The
output with C1 equal to0 is a double phase-rectified voltage of
R2/R1.....(design idea) |
|
PWM AC/DC Power Supply Design Apex-AN35 - Apex App Note |
|
Rectifier tracks positive & negative peaks - 06/08/06 EDN-Design
Ideas: Versatile precision rectifier also delivers full-wave
output.....(design idea) |
|
Run Switching Type AC Power Adapters on DC - I have received a
couple emails from people looking for inexpensive DC to DC converters,
which can convert 40v to 60v DC into say +5 or +12v. Such input
voltages are often found in new automotive and industrial applications
with a typical DC voltage of 48 volts. It turns out that many, not all,
but many, standard AC line operated power adapters, which use switch
mode techniques, will indeed work great when supplied with DC instead of
AC. The unit below works down to about 30v DC and delivers 500ma at 5v.
If you draw less current, it will operate at even lower DC input
voltages.... ….(designed by David A. Johnson) |
|
SCR Voltage Regulator - Though not as accurate as a linear or a
high-frequency switching regulator, an SCR voltage regulator wastes
little power and creates no RFI. Designed by Andrew R. Morris |
|
Silicon Controlled Rectifier Model Railroad Throttles & London Model
Railroad Group SCR Throttle - The following is a schematic drawing
of a Silicon Controlled Rectifier type throttle for use on larger scale
model railroads. Three versions of this throttle are shown on this page.
They are not sophisticated designs but work well and are tough and
reliable. |
|
Step Down Rectifier Makes a Simple DC Power Supply - 04/09/98 EDN-Design
Ideas: -- A simple and useful nonisolated rectifier features voltage
step-down operation, acceptable Class A line-current harmonics, inherent
short-circuit protection, and, optionally, a regulated
output.....(design idea) |
|
Supply uses AC to generate 5V Power on reset - 05/16/02 EDN-Design
Ideas: The need often arises for a low-cost logic supply for powering
microcontrollers and related circuitry in "white-goods" products, such
as industrial controllers and sensors. These applications usually
include 24 or 115V ac or higher levels of ac voltage for conversion to
3.3 or 5V dc. The simplest approach to generating
low-current.....(design idea) |
|
Thermostat for 1KW Space Heater SCR controlled - Here is a simple
thermostat circuit that can be used to control a relay and supply power
to a small space heater through the relay contacts. The relay contacts
should be rated above the current requirements for the heater. |
|
Transformerless Mains Power Supply - This power supply does not
really excel in power efficiency, but it is the cheapest and most
compact solution for a small power supply. Note that the low voltage
output is directly connected to the mains; it cannot be used when the
low voltage part can be touched. With the component values of the
schematic, the circuit can supply12V /15mA max. |
|
Transformerless Power Supply (Aaron Cake) - (electronic circuit) |
|
Transformerless Power Supply (jose pino) - Simple, low cost and easy
to build power supply. Ideal for applications that doesn't require too
much power. |
|
Transformerless Power Supply (Len Galasso) - This power supply uses
the reactance of a non-polarized capacitor at 60hz to step-down the
voltage from the normal 117VAC level to about 20 volts or so, which is
rectified by the diode….(circuit design) |
|
Transformerless Power Supply (Ron J) - This circuit will supply up
to about 20ma at 12 volts. It uses capacitive reactance instead of
resistance, so it doesn't generate very much heat. The circuit was
disguising an optically-isolated triac. |
|
Transient Protection of Darlington gain block Amplifiers - AN-60-034
Application Note MiniCircuits.com (app note) |
|
True RMS Detector - National Semiconductor Application
Notes,28-Jun-1996 / (app note) |
|
Two OpAmps Make Fast Full Wave Rectifier - 03/14/96 EDN-Design
Ideas: The circuit in Figure 1 is a precision full-wave rectifier with
the following characteristics: Minimal delay time between the input and
output (with only one op amp in the chain); Similar delay times for
positive and negative inputs; No need to match diodes or adjust
resistors. When VIN>0V, the output of op amp IC1 is negative, so
….....(design idee) |
|
Ultra Low Drop Linear Regulator - (circuit / schematic design) |
|
Ultra-Linear 32W Amplifiers 500-1000MHz LZY-2 - AN-60-005
Application Note MiniCircuits.com (app note) |
|
Ultra-Linear 50W Amplifiers 20-512MHz LZY-1 - AN-60-004
Application Note MiniCircuits.com (app note) |
|
Unregulated power supply - A basic full wave rectified power supply
is shown below. The transformer is chosen according to the desired load.
For example, if the load requires 12V at 1amp current, then a 12V, 1 amp
rated transformer would do. However, when designing power supplies or
most electronic circuits,....(schematic) |
|
Uses & Advantages of MERA Dual Matched MMIC Amplifiers - Application
Note MiniCircuits.com (app note) |
|
Using the Catalog Specifications to Determine MMIC Reliability -
AN-60-030 Application Note MiniCircuits.com (app note) |
|
Very Low Dropout VLDO Linear Regulators Supply Low Voltage Outputs -
DN292 Design Notes (Linear Technology) (app note) |
