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Battery Monitor (CB4371E)
Overtone Oscillator II (CB4585E)
Sequential Upand Down (CB4579E)
Simple Night Switch 2 (CB4563E)
Encoder with the 4017 (CB4528E)
Voltage Regulator LM3900 (CB4506E)
Termistor Bridge (CB4394E)
Up to 200 MHz Oscillator (CB4344E)
MW Wireless Microphone (CB4516E)
Sampling and Holding with the LM308 (CB4489E)
Touch Didactic Counter (CB4466E)
TDA2020 Amplifier (CB4357E)
Tic Tac Toe with LEDs (CB4322E)
Powerful FM Transmitter (CB4330E)
Rocket Launcher (CB4447E)
LED Indicator LM3909N (CB4555E)
Diodes & Fuses Test (CB4536E)
Medium Wave Radio (CB4458E)
Car Burglar Alarm (CB4439E)
Headphone Amplifier (CB4386E)
Transceiver To 13.5 MHz (CB4411E)
20 LEDs Flasher For Christmas Tree (CB4420E)
5V x 5 A Switching Regulator LT1074 (CB4402E)
Solar Alarm Clock (CB4305E)
Incandescent Flasher (CB4595E)
Electronic Music (CB4430E)
Complementary Oscillator (CB4372E)
Variable Frequency Oscillator (VFO) (CB4586E)
Digital Volume Control Treble and Bass Balance (CB4576E)
Infrared Sensor with the MC3373 (CB4580E)

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Circuit Bench

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      The critical components for this 1970s project are transformers. The original transistors are made...

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          Found in a 90s Popular Electronics, this circuit keeps an LED on when a phone is in use. Can be...

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