Newest circuit diagrams
Transistor Based - Single Zone Alarm
This circuit features automatic Exit and Entry delays - timed Bell/Siren cut-off - and system reset. It has provision for normally-open and normally-closed switches - and will suit all of the usual input devices (Pressure Mats, Magnetic Reed Contacts, Foil Tape, PIRs and Inertia Sensors). Read more...
Field Strength Meter
This is a wide band signal strength meter circuit which responds to small changes in RF energy, designed to be used for the VHF spectrum and will respond to AM or FM modulation or just a plain carrier wave. Read more...
Precision Metronome & Pitch generator
Precision Frequency generator 1 to 999 Hz. Precision Metronome 1 to 999 beats per minute Read more...
Electronic Candle Blow Out
LED or bulb switch off with a puff. Funny gadget - 3V Battery supply. Read more...
25 Watt Power Amplifier
This is a 25 Watt power amplifier complete with separate preamp and tone controls. In addition the circuit has a loudness control (to boost bass at low audio power) and options for super bass and super treble enhancement. This is ideal for Ipod's, MP3 or CD players or can be used as a booster amplifier. Read more...
E.S.P. Conjuring Trick
A former President of the Magic Circle, three times awarded the International Award for Magic, commented when he saw this trick: "Absolutely incredible!" Read more...
Electromagnetic Field Detector
This circuit is sensitive to low frequency electromagnetic radiation and will detect for example hidden wiring or the field that encompasses a transformer. Read more...
Infrared Link
This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low - giving a good battery life; and by shutting down in the presence of extraneous IR radiation it copes with the problem of excessive output current. Read more...
