David A. Johnson
David A. Johnson
Areas of interest of the author: Digital Measurement Beginners Wireless Supply Light Solar Analogue Design Amplifiers Oscillators Audio Bad Prescriptions
Publications on RadioLocman by the author David A. Johnson:
- Touch activated switch needs 1.5 voltsSep 22, 2026
- Piezoelectric vibration sensor activates switchSep 7, 2026
- Wireless LED flasherSep 2, 2026
- Logic controlled 12V DC motor with automatic brakeJul 27, 2026
- Bidirectional solid state relayJul 27, 2026
- Medium power 12V brush motor speed controllerJul 27, 2026
- Eight solar cell lithium-ion battery chargerJul 16, 2026
- Isolated remote switch circuitJul 15, 2026
- Cascode light receiver circuitJul 8, 2026
- Charge pump efficiently divides supply voltageJun 17, 2026
- N-ch and P-ch transistors form push-pull driverJun 9, 2026
- Circuit protects from battery polarity reversalJun 9, 2026
- Low power oscillatorsMay 27, 2026
- Over-temperature micro-power alarmMay 14, 2026
- Piezoelectric tap switchMay 7, 2026
- 3V sweeping siren alarmMar 17, 2026
- Single IC forms sensitive modulated light receiverMar 6, 2026
- Charge coupled MOSFET relayJan 22, 2026
- Solar mason jar lightDec 10, 2025
- CMOS Schmitt trigger IC makes VCONov 24, 2025
- On/off latch circuitOct 14, 2025
- Circuit forms ideal diode functionOct 14, 2025
- Circuit forms divide by 1.5 counterOct 10, 2025
- Micropower CMOS oscillator, draws only 0.5 µAAug 31, 2025
- +5V powered charge pump battery chargerJun 30, 2025
- 1 amp current injector circuitJun 26, 2025