Converters: AC to AC Circuits beginning with #-I

AC to AC Converters (AC to AC Power Supplies and Transformer Circuits) Page 1
AC to AC: #-I J K-Z Converters -- Main Page
Last Updated on: Thursday, October 29, 2009 06:12 AM

Circuits Designed by Dave Johnson, P.E. :

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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

+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. (app note added 4/05)

150 Ohm Line to 600 Ohm Load Application - AS011 Jenson Transformer Application Note. Isolation transformer with impedance conversion (app note 04/03/02)

2-Way Passive Guitar Splitter - AS013 Jenson Transformer Application Note. From one guitar to two guitar amplifiers (app note 04/03/02)

4-Way Active Guitar Splitter - AS014 Jenson Transformer Application Note. From one guitar to up to four guitar amplifiers (app note 04/03/02)

50 Ohm Long Line Driver - AS029 Jenson Transformer Application Note (app note 6/07)

50 Ohm Long Line Receiver & Driver - AS028 Jenson Transformer Application Note (app note 6/07)

600 Ohm Line Isolation Application - AS010 Jenson Transformer Application Note. Isolation transformer for 600 ohm balanced audio line (app note 04/03/02)

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 (circuit design added 04/05/06)

AC Couple Analog Signals without a DC Bias Source - 02/03/00 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.... (added 11/05)

Additional RFI Protection for Line Input Circuits - AS072 Jenson Transformer Application Note (app note 5/02)

Algorithm Tests for Point Location - 08/03/00 EDN-Design Ideas: (design idea added 11/05)

Algorithm Transforms Filter Coefficients - 01/21/99 EDN-Design Ideas:.....(design idea added 6/06) 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 (app note 6/07)

An Acoustic Transformer Powered Super-High Isolation Amplifier - National Semiconductor Application Note (app note added 6/06)

AN134 AES & SPDIF Recommended Transformers - (app note added 6/07)

AN-285: An Acoustic Transformer Powered Super-High Isolation Amplifier - National Semiconductor Application Note (app note added 6/06)

Anti-RIAA Equalizer for Line to Mag Phono Converter - AS071 Jenson Transformer Application Note (app note 6/07)

Balanced Line Inputs/Outputs for Silicon Graphics workstations - AS075 Jenson Transformer Application Note (app note 7/02)

Balanced Line Level to Unbalanced Guitar Level - AS092 Jenson Transformer Application Note (app note 6/07)

Balanced Tube Line Input Stage - AS088 Jenson Transformer Application Note (app note 6/07)

Balanced XLR Input to Unbalanced RCA Output - AS089 Jenson Transformer Application Note (app note 6/07)

Balun Transformers - Application Note MiniCircuits.com (app note added 08/08/08)

Basic Hum Stopper Transformer Isolation Box - AS036 Jenson Transformer Application Note. Simple isolator for 600 ohm balanced audio lines (app note 04/03/02)

Bi-directional Lo-Z Long Line Application - AS077 Jenson Transformer Application Note (app note 6/07)

Build the Hummer to Find Pin 1 Problems in Equipment - AS032 Jenson Transformer Application Note (app note 08/08/08)

Cascode Tube Microphone Input Stage - AS054 Jenson Transformer Application Note (app note 6/07)

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 (added 11/05)

Conversion of Unbalanced Input to Balanced - AS002 Jenson Transformer Application Note (app note 11/02)

Converts 600 Ohm Unbalanced Mic to 150 Ohm Balanced Mic Line - AS049 Jenson Transformer Application Note (app note 11/02)

Converts Consumer Stereo Inputs to Mono Balanced Mic Output - AS078 Jenson Transformer Application Note (app note 6/07)

Converts High Impedance Input to X10 Balanced Audio Input - AS090 Jenson Transformer Application Note (app note 6/07)

Converts Unbalanced Output to Balanced - AS052 Jenson Transformer Application Note (app note 11/02)

Differential Line Driver with Feedback Around the Transformer - AS051 Jenson Transformer Application Note (app note 6/07)

Direct Box for Very High Level Signals - AS008 Jenson Transformer Application Note (app note 6/07)

Dual JT-MB-C Microphone Combining Circuit - AS053 Jenson Transformer Application Note (app note 5/02)

Everything You Wanted to Know About Wideband Low Frequency Transformers - 11/23/00 EDN-Design Ideas:.....(design idea added 5/03)

External Isolation Transformer Box for Mackie - AS073 Jenson Transformer Application Note (app note 04/03/02)

Famous Twin-Servo 990 Mic Preamp Basic Circuit - AS083 Jenson Transformer Application Note (app note 6/07)

Floating Supply for LCD Panel Meter - includes several designs, scroll down to find this one (added 8/03)

Flyback circuit provides isolated power Conversion - 01/07/99 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.....(design idea added 08/05)

Full-featured Direct Box Application Schematic - AS066 Jenson Transformer Application Note (app note 6/07)

Generic Tube Line Input Stage - AS087 Jenson Transformer Application Note (app note 6/07)

Grounding & Shielding - describes basic audio transformer uses like balanced in/out and signal splitters (added 4/02)

Guitar to Amp Long Line Circuit - AS097 Jenson Transformer Application Note (app note 6/07)

Ham Radio Line Level to Mic Level Circuit - AS096 Jenson Transformer Application Note (app note 6/07)

High CMRR Balanced Interface for Crystal 18 or 20 Bit A/D Converters - AS062 Jenson Transformer Application Note (app note 04/03/02)

High Level High Current Differential Output Stage with DC Servo - AS031 Jenson Transformer Application Note (app note 11/02)

High Level Low Impedance Differential Output Stage with DC Servo - AS034 Jenson Transformer Application Note (app note 11/02)

High Output Line Driver for Single Ended Power Supply - AS079 Jenson Transformer Application Note (app note 04/03/02)

High Performance Audio Op-Amp Quick Reference - AS050 Jenson Transformer Application Note (app note 6/07)

How RF transformers work & how they are measured - Application Note MiniCircuits.com (app note added 3/07)

IC Mic Preamp uses Jensen Twin-Servo Circuit Topology - AS082 Jenson Transformer Application Note (app note 11/02)

Improves CMRR of Electronically Balanced Line Inputs - AS069 Jenson Transformer Application Note (app note 11/02)

Improves Performance of SSM2015 Mic Preamp IC - AS063 Jenson Transformer Application Note (app note 6/07)

Improves Performance of SSM2017 Mic Preamp IC - AS064 Jenson Transformer Application Note (app note 11/02)

Input Stage for Crystal A to D Converters - AS043 Jenson Transformer Application Note (app note 04/03/02)

Input Transformer for Crystal CS5367 A/D Converter - AS086 Jenson Transformer Application Note. Transformer balanced passive input circuit for CS5367 A/D converter (app note 04/03/02)

Interconnection of Balanced & Unbalanced Equipment - 4 page booklet in PDF format (added 4/02)

Internal Modification to Mic Inputs of the Mackie 1604 Mixer Eliminates RFI Problems - AS074 Jenson Transformer Application Note (app note 04/03/02)

Introduction, definition of terms, Q&As-tran14-2 - Application Note MiniCircuits.com (app note added 04/05/06)

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. ….(designed by David A. Johnson)

Isolated Line Output from Guitar Amplifier - AS045 Jenson Transformer Application Note (app note 11/02)

Isolates & Converts Guitar Amp Speaker Out to Line Output - AS061 Jenson Transformer Application Note (app note 11/02)

Isolates & Converts Speaker Drive to Line Level - AS068 Jenson Transformer Application Note (app note 11/02)

Isolates 70 Volt Line & Converts to Line Level - AS059 Jenson Transformer Application Note (app note 11/02)

Isolates both Mic & Line Inputs of Inexpensive Mixer - AS015 Jenson Transformer Application Note (app note 11/02)

Isolates Phantom Powered Guitar or Instrument Buffer - AS004 Jenson Transformer Application Note (app note 6/07)

Isolation Transformer Passes Millihertz Signals - 08/04/94 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. The simple circuit in.....(design idea added 3/03)

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. Transformers for audio use have some problems like.... (added 11/05)

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