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AC to AC Converters - AC to AC
Power Supplies and Transformer Circuits

+12V/-12V Power Supply Unit - To work  circuit which used  operational amplifier and so on,  positive and  negative power supply become necessary.  power supply which I introduce here is  one to have used  unit which has  two power supplies of 12 V in  one unit. Power supply unit is using  ready-made. It inputs AC100 V and it is possible to take out 12 V of  two DCs which are independent as  output.

150 Ohm Line to 600 Ohm Load Application - AS011 Jenson Transformer Application Note.  Isolation transformer with impedance conversion

2-Way Passive Guitar Splitter - AS013 Jenson Transformer Application Note.  From one guitar to two guitar amplifiers

4-Way Active Guitar Splitter - AS014 Jenson Transformer Application Note.  From one guitar to up to four guitar amplifiers

50 Ohm Long Line Driver - AS029 Jenson Transformer Application Note

50 Ohm Long Line Receiver & Driver - AS028 Jenson Transformer Application Note

600 Ohm Line Isolation Application - AS010 Jenson Transformer Application Note.  Isolation transformer for 600 ohm balanced audio line

A Zero-Feedback SRPP-Input Headphone Amplifier - Features a series regulated push-pull input stage and transformer-coupled output stage with an output impedance of about 2.5 ohms. It has zero global feedback for open, natural sound without any harshness.  Designed by Simon Busbridge

AC Couple Analog Signals without a DC Bias Source - EDN-Design Ideas: /  A conventional ac-coupling circuit in a single-supply system comprises a series capacitor and a shunt resistor to ground. Unfortunately,  negative peaks of  input signal can exceed  -0.3V input operating-range limits of an ADC, such as  LTC1402 serial 12-bit sampling ADC. To avoid going below ground,  circuit must return  shunt input....

Additional RFI Protection for Line Input Circuits - AS072 Jenson Transformer Application Note

Algorithm Tests for Point Location - EDN-Design Ideas

Algorithm Transforms Filter Coefficients - EDN-Design Ideas: To synsize infinite-impulse-response (IIR)-filter functions, expressed as H(z), you commonly use analog prototype-filter functions, expressed as H(s), using  bilinear-z transform. This operation entails some algebraic complexity in calculating  filter coefficients. The simple algorithm shown here transforms  prototype-filter coefficients (W0, W1, W2)to  IIR digital-filter coefficients (U0, U1, U2). These coefficients transform from  s (analog)domain to  z (digital)domain....

Alway On Signal Sensing Subwoofer Mute Circuit - AS101 Jenson Transformer Application Note

An Acoustic Transformer Powered Super-High Isolation Amplifier - National Semiconductor Application Note

AN134 AES & SPDIF Recommended Transformers

AN-285: An Acoustic Transformer Powered Super-High Isolation Amplifier - National Semiconductor Application Note

Anti-RIAA Equalizer for Line to Mag Phono Converter - AS071 Jenson Transformer Application Note

Balanced Line Inputs/Outputs for Silicon Graphics workstations - AS075 Jenson Transformer Application Note

Balanced Line Level to Unbalanced Guitar Level - AS092 Jenson Transformer Application Note

Balanced Tube Line Input Stage - AS088 Jenson Transformer Application Note

Balanced XLR Input to Unbalanced RCA Output - AS089 Jenson Transformer Application Note

Balun Transformers - Application Note MiniCircuits.com

Basic Hum Stopper Transformer Isolation Box - AS036 Jenson Transformer Application Note.  Simple isolator for 600 ohm balanced audio lines

Bi-directional Lo-Z Long Line Application - AS077 Jenson Transformer Application Note

Build the Hummer to Find Pin 1 Problems in Equipment - AS032 Jenson Transformer Application Note

Cascode Tube Microphone Input Stage - AS054 Jenson Transformer Application Note

Connect Line-Level Signal to Phono Input  - The circuit does two functions: signal level attenuation and inverse RIAA filtering. The signal attenuation is needed to convert the 500 mV signal to 2.5 mV signal. The inverse-RIAA filtering is needed to make the frequency response of the system flat (same equalization that is used when music is transferred to vinyl in the studio). The picture blow shows the frequency response of the ideal inverse-RIAA filter

Conversion of Unbalanced Input to Balanced - AS002 Jenson Transformer Application Note

Converts 600 Ohm Unbalanced Mic to 150 Ohm Balanced Mic Line - AS049 Jenson Transformer Application Note

Converts Consumer Stereo Inputs to Mono Balanced Mic Output - AS078 Jenson Transformer Application Note

Converts High Impedance Input to X10 Balanced Audio Input - AS090 Jenson Transformer Application Note

Converts Unbalanced Output to Balanced - AS052 Jenson Transformer Application Note

Differential Line Driver with Feedback Around the Transformer - AS051 Jenson Transformer Application Note

Direct Box for Very High Level Signals - AS008 Jenson Transformer Application Note

Dual JT-MB-C Microphone Combining Circuit - AS053 Jenson Transformer Application Note

Everything You Wanted to Know About Wideband Low Frequency Transformers - EDN-Design Ideas

External Isolation Transformer Box for Mackie - AS073 Jenson Transformer Application Note

Famous Twin-Servo 990 Mic Preamp Basic Circuit - AS083 Jenson Transformer Application Note

Floating Supply for LCD Panel Meter - includes several designs, scroll down to find this one

Flyback circuit provides isolated power Conversion  - EDN-Design Ideas: A common requirement in telecommunications systems is to convert an unregulated 48V line to an isolated, accurate dc supply voltage. The circuit in Figure 1 provides a 5V, 15W output. The circuit uses a UCC3809 primary-side controller, which can also control other single-ended converters. The topology uses peak-current-mode control with a fixed-frequency oscillator. The design is cost-efficient

Full-featured Direct Box Application Schematic - AS066 Jenson Transformer Application Note

Generic Tube Line Input Stage - AS087 Jenson Transformer Application Note

Grounding & Shielding Audio Device - Splitting Signals, Sub-woofing in Mono, Unbalanced Summing, Balanced Summing, Output Impedances.

Guitar to Amp Long Line Circuit - AS097 Jenson Transformer Application Note

Ham Radio Line Level to Mic Level Circuit - AS096 Jenson Transformer Application Note

High CMRR Balanced Interface for Crystal 18 or 20 Bit A/D Converters - AS062 Jenson Transformer Application Note

High Level High Current Differential Output Stage with DC Servo - AS031 Jenson Transformer Application Note

High Level Low Impedance Differential Output Stage with DC Servo - AS034 Jenson Transformer Application Note

High Output Line Driver for Single Ended Power Supply - AS079 Jenson Transformer Application Note

High Performance Audio Op-Amp Quick Reference - AS050 Jenson Transformer Application Note

How RF transformers work & how they are measured - Application Note MiniCircuits.com

IC Mic Preamp uses Jensen Twin-Servo Circuit Topology - AS082 Jenson Transformer Application Note

Improves CMRR of Electronically Balanced Line Inputs - AS069 Jenson Transformer Application Note

Improves Performance of SSM2015 Mic Preamp IC - AS063 Jenson Transformer Application Note

Improves Performance of SSM2017 Mic Preamp IC - AS064 Jenson Transformer Application Note

Input Stage for Crystal A to D Converters - AS043 Jenson Transformer Application Note

Input Transformer for Crystal CS5367 A/D Converter - AS086 Jenson Transformer Application Note.  Transformer balanced passive input circuit for CS5367 A/D converter

Interconnection of Balanced & Unbalanced Equipment - 4 page booklet in PDF format

Internal Modification to Mic Inputs of the Mackie 1604 Mixer Eliminates RFI Problems - AS074 Jenson Transformer Application Note

Introduction, definition of terms, Q&As-tran14-2 - Application Note MiniCircuits.com

Isolated AC Current Monitor - This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding.  The transformer contains a single turn primary with a low 0.001-ohm resistance.  It can easily handle 30 amps of AC current and provides at least 500vac of isolation.  With the components shown, the output AC voltage is scaled so 1 amp of current produces 100mv of AC voltage.

Isolated Line Output from Guitar Amplifier - AS045 Jenson Transformer Application Note

Isolates & Converts Guitar Amp Speaker Out to Line Output - AS061 Jenson Transformer Application Note

Isolates & Converts Speaker Drive to Line Level - AS068 Jenson Transformer Application Note

Isolates 70 Volt Line & Converts to Line Level - AS059 Jenson Transformer Application Note

Isolates both Mic & Line Inputs of Inexpensive Mixer - AS015 Jenson Transformer Application Note

Isolates Phantom Powered Guitar or Instrument Buffer - AS004 Jenson Transformer Application Note

Isolation Transformer Passes Millihertz Signals - EDN-Design Ideas: You can successfully use an ordinary low-cost line transformer as an isolation transformer in ac circuits that require floating sources. However, at frequencies below 20 to 30 Hz, high distortion and excessive phase shifting occur.

Isolator Transformer for Audio Lines - If you want to do the ground loop elimination in audio path, you have to cut the galvanic connection but pass the whole audio range. The simplest and most common way to do the isolation is use audio transformer which is ment for audio use.
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