Please Note:
In Testgear, you can find testing circuits for sound, Infra Red and light, electromagnetic probes and other test circuits for components. All circuits are listed alphabetically on the Circuit Index page and in date order on the update page. All contributors are listed on the credits page.

If you have problems try my help page first. Most circuits on this site use SI Notation. Due to large volumes of email, I regret that I can only answer questions about circuits on my site.

For help or to contribute please email me
  1. Zener Diode Tester by Aleksander Dakic
  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 Samin
  19. Transistor Tester
  20. RF Probe
  21. Small Audio Test Set by Rodney Byne
  22. PC Scope Probe by Rodney Byne
  23. Dual PSU and 50Hz Calibration Aid by Rodney Byne Updated 21-12-2016
  24. Wideband RF Millivoltmeter by Rodney Byne
  25. Wideband RF Sniffer by Rodney Byne
  26. Sound Level Meter
  27. LM317 Tester by Abu-Hafss, Pakistan
  28. Energy Saving Soldering Station by Abu-Hafss, Pakistan
  29. Inductance Meter by Abu-Hafss, Pakistan
  30. CDI Tester by Abu-Hafss, Pakistan
  31. Regulator-Rectifier Tester by Abu-Hafss, Pakistan
  32. 7 Waveform Generator by Rodney Byne
  33. Wideband Noise Generator
  34. AC Voltmeter
  35. DC Voltmeter
  36. Absorption Wavemeter
  37. Voltage Controlled Oscillator External Link to Hackatronic
  38. High Impedance Bench Amplifier
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