Newest circuit diagrams
This logic probe uses a single CMOS 4001 IC and can display high, low and pulsing outputs.
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A compact 2 transistor transmitter for use at VHF frequencies.
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Two strips of LEDs fading in a complementary manner. 9V Battery-operated portable unit
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A simple op-amp feedback circuit designed to regulate the speed of a DC motor.
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An electronic recitification circuit. The use of large, heavy and expensive electrolytic capacitors is avoided, being replaced by an active transistor in this gyrator circuit.
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This switch will suit the Modular Burglar Alarm circuit. However, it also has other applications. The Keypad must be the kind with a common terminal and a separate connection for each key.
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5 to 15V supply - LED indicator. Adjustable time detection
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This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm.
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Detects the presence of a live mains conductor Minimum parts counting
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Detects if a device is not properly connected to its supply Suitable for battery chargers, portable appliance supplies etc.
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