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Counters and Timer Circuits




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1 Second Time Base From Crystal Oscillator (circuitdb):  The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0.01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage.

1 Second Time Base from Crystal Oscillator:  (electronic circuit)

10 Hints for using Your Power Supply to Decrease Test Time (5968-6359E):  Learn ten simple ways to improve your testing capabilities with your power supplies and electronic loads. Aligent Application Note (app note)

100 MHz Clock Solution for Desktop Computers:  Pericom Semiconductor Application Brief # 021 (app note)

2 Transistor Atomic Frequency Standard:  (schematic)

2.8 GHz prescaler keeps cost down:  07)/20/00 EDN-Design Ideas

28 LED Clock Timer 72 LED Clock:  programmable clock Timer circuit that uses individual LEDs to indicate hours and minutes

2D3 Nixie clock Schematic:  (electronic circuit)

30 Nanosecond Settling Time Measurement for a Precision Wideband Amplifier:  AN79 Linear Technology AN79 modifies methods presented in AN74, permitting verification of 30 nanosecond amplifier settling times to 0.1% resolution.  sampling-based technique used is detailed and results presented. Appendices cover oscilloscope overdrive issues, construction of a subnanosecond rise time pulse generator, amplifier compensation, circuit construction and calibration procedures.

4 Bit Binary Clock:  (schematic)

4 Channel Timer using Atmel 89C4051 and MAX7219 display Driver:  (circuit / schematic)

4 Hints for Making Better Microwave Counter Measurements:  Agilent Application Note

40 LED Bicycle Light (555 Timer 6 Volt):  (schematic)

5 to 30 Minute Timer (MIT):  (electronic circuit)

5 to 30 Minute Timer:  (schematic)

50 MHz Frequency Counter Voltage Meter and SwR/PWR Indicator:  (electronic Circuit diagram)

555 DC-AC Inverter:  (circuit / schematic design)

555 Go/No Go Tester:  (schematic)

555 Makes Handy Voltage to time Converter:  02/01/01 EDN-Design Ideas. The circuit in Figure 1 is a simple, low-cost voltage-to-time converter using  ubiquitous 555 timer chip. You can use  IC's monostable multivibrator as a voltage-to-time converter by connecting  analog-voltage input to  charging resistor, R, instead of connecting R to VCC. With this modification,....

555 One Shot:  Basic 555 MonoStable Multivibrator

555 Oscillator:  (app note)

555 Timer #2:  (app note)

555 Timer 40kHz Infrared Oscillator:  (electronic circuit)

555 Timer as an A/D Converter:  Measure voltages accurately with a microcontroller using this simple circuit. Includes sample program for  Parallax Basic Stamp

555 Timer IC Tester:  (schematic)

555 timer Mono stable (one shot) circuit:  The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time.

555 Timer MonoStable Circuit using Pushbutton:  (circuit)

555 Tone Generator 8 Ohm Speaker:  (electronic diagram)

555-based solar engine:  Time-Controlled Solar Engine: a solar engine design using a 555 timer IC

6 Digit 40MHz Frequency Counter Module:  Here is  design for a very low cost 6-digit frequency counter module using of  shelf components (and not that expensive 74C926!). The standard circuit will display directly in Hz (1MHz max), and re is a separate on board divider that will allow you to display directly in KHz (approx 40MHz max). Because  display reads directly in....  (add 11/05)

7 Segment LED Counter:  (circuit)

72 LED Clock:  (circuit)

74ACT74 makes Low-skew clock divider:  12/17/98 EDN-Design Ideas - Serial-data systems often generate an internal clock at twice  data rate for mid-bit sampling or for generating bi-phase codes. External equipment and some internal processes require a clock that runs at  data rate. Simply dividing  twice-rate clock with a flip-flop generates a data-rate clock that is .... 

8 Hints for Making Better RF Counter Measurements:  Agilent Application Note

80186 timer pins provide general I/O :  08/03/98 EDN-Design Ideas Intel's (www.intel.com) 80186 is a highly integrated mP common in embedded applications. It combines 15 to 20 common iAPX86 system components, such as a DMA controller, an interrupt controller, timers, a clock generator, a bus interface, and chip-select logic on one chip. Unfortunately, unlike many mCs, it provides....

9 Second Digital Readout Timer:  (circuit)

9 Second LED Relay Timer:  (circuit)

A 2.x GHz WiMAX Direct Conversion Transmitter:  AN-826 Analog Devices Application Notes  (app note)

A Design and Manufacturing Guide for the Lead Frame Chip Scale Package:  AN-772 Analog Devices Application Notes  (app note)

A GPS receiver based frequency standard:  (diagram)

Acquisition Times of the ADN2812:  AN-757 Analog Devices Application Notes  (app note)

Ad-03: Effects of Aperture Time and Jitter in a Sampled Data:  National Semiconductor Application Note   (app note)

AD9852 DDS schematic:  (circuit / schematic )

ADN2812 Evaluation Board:  AN-657 Analog Devices Application Notes  (app note)

ADN2819 Evaluation Board:  AN-636 Analog Devices Application Notes  (app note) This application note describes  use of  ADN2819 evaluation board. The ADN2819 is a multirate clock recovery, data-retiming device based on a multiloop PLL architecture. The ADN2819 can recover clock and data at SONET OC-3,OC-12,OC-48,and Gigabit Ernet data rates as well as 15/14 Forward Error Correction (FEC) ....

Amplifier Timer:  Turns-off your amplifier when idle for 15 minutes Fed by amplifier tape-output  (circuit / schematic design)

Amplifiers perform precision divide by 2 circuit:  02/06/03 EDN Design Ideas  / The classic implementation of a voltage-halving circuit uses two equal-value resistors. Using 1% resistors provides a divider output with 2% accuracy. For most applications, this performance is cost-effective and more than adequate. However, when you need extreme precision, this approach requires correspondingly accurate resistors and can become expensive....

An Overview of Pericom's VCXO and Crystal Technology:  Pericom Semiconductor Application Note # 048 (app note)

AN-1173: High Speed BUS LVDS Clock DistributionUsing the DS92CK16 Clock Distribution Device:  National Semiconductor Application Note   (app note)

AN-1312: Scan Bridge (STA111/STA112) Timing:  National Semiconductor Application Note   (app note)

AN-1439: Use of the LMV112 to Reduce Reference Clock Interaction in Handheld Device:  National Semiconductor Application Note   (app note)

AN-214: Ground Rules for High Speed Circuits:  AN-214 Analog Devices Application Notes  (app note) Layout and Wiring Are Critical in Video Converter Circuits.

AN-30: Ask the Applications Engineer-PLL Synthesizers:  AN-30 Analog Devices Application Notes  (app note)

AN-347: Shielding and Guarding:  AN-347 Analog Devices Application Notes  (app note) How to Exclude Interference-Type Noise. What to do and Why to do it-A Rational Approach

AN-349: Keys to Longer Life for CMOS:  AN-349 Analog Devices Application Notes  (app note) Here's How CMOS Can be Protected Against Abuse

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