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AC to AC Converters (AC to AC Power Supplies and Transformer Circuits)   Page 2
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Last Updated on: Monday, October 03, 2011 06:07 PM

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:

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 ideband, low-frequency transformers are useful components in various passive circuits, such as the return-loss bridge (Reference 1, Figure 2). Figure 1a shows a conventional transformer. If you connect the transformer windings differently, you can configure a transmission-line....PDF has several circuits, scroll down for this one.... [Design Idea by Richard Kurzrok, Queens Village, NY]

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 Issue of EDN 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....Page includes several designs. Scroll to find this one.... [Design Idea by Philip Cooke, Unitrode Corp, Merrimack, NH]

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

AC to AC: #-A B-F G-I J K-O P-S T-Z
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