Please Remember:
New circuits are updated regularly and listed in date order on the update page. If you have problems try my help page and remember that most circuits on this site use SI Notation. Due to the volume of email that I receive each day, I regret that I can only answer questions about circuits featured on my site. You may find the Circuit Index useful.

For help or to submit a circuit please email me

  1.   Zener Diode Tester

  2.   Infra Red Remote Control Tester

  3.   Electromagnetic Field Probe with Meter

  4.   Simple Square Wave Oscillator

  5.   Logic Probe

  6.   Function Generator

  7.   MilliGauss Meter by Rev Tomas Scarborough

  8.   Multi Wire Cable Tester

  9.   Connection Tester

  10.  Sine Wave Generator

  11.  Two Crystal Test Circuits

  12.  Bench Amplifier

  13.  Signal Injector and Tracer

  14.  Beat Balance Metal Detector by Rev Thomas Scarborough

  15.  Coil Coupled Operation Metal Detector by Rev Thomas Scarborough

  16.  Low Frequency Oscillator

  17.  EMF Probe Version 2

  18.  Field Strength Meter for 2.4Ghz by John Samnin

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