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 Samin
19. Transistor Tester
20. RF Probe
21. Small Audio Test Set by Rodney Byne
22. PC Scope Probe by Rodney Byne
23. 50Hz Calibration Aid by Rodney Byne
24. Wideband RF Millivoltmeter by Rodney Byne