All Sections: Fairchild

1. Bidirectional solid state relay
   David A. Johnson
   Circuits Nexperia PMV30UN
   .. the circuit will switch on fully with only 5 mA of LED current. Materials on the topic Datasheet Nexperia PMV30UN Datasheet Fairchild 1N5818 Datasheet Fairchild 1N5819 discovercircuits.com
   Jul 27, 2026

2. A pot of many colors
   Nick Cornford
   Circuits Microchip MCP6002
   .. hat waterproof, because rainbows imply rain and have some digital fun doing it properly. Materials on the topic Datasheet Fairchild BC557B Datasheet Microchip MCP6002
   Jun 24, 2026
3. Charge pump efficiently divides supply voltage
   David A. Johnson
   Circuits Fairchild MM74C14
   .. a few FETs and logic devices to down convert a DC voltage to about one half its value. Materials on the topic Datasheet Fairchild MM74C14 Datasheet Diodes ZVN2106A Datasheet Diodes ZVP2106A discovercircuits.com
   Jun 17, 2026
4. Low power oscillators
   David A. Johnson
   Circuits Fairchild 2N3904 2N3906
   .. for a low frequency application. Both circuits draw only about 1 microamp of current. Materials on the topic Datasheet Fairchild 2N3904 Datasheet Fairchild 2N3906 discovercircuits.com
   May 27, 2026
5. Advanced sensitive lightning detector with PC graph
   Mirko Pavleski
   Circuits Fairchild 2N3904
   .. discharges in the environment 24/7. Reference Soundcard and Audio Processing Software Materials on the topic Datasheet Fairchild 2N3904
   May 27, 2026
6. BJT is accurate sensor for absolute temperature in Kelvin and Rankine
   Stephen Woodward
   Circuits NXP 74HC4053
   .. Williams, Jim. Measurement and Control Circuit Collection. Materials on the topic Datasheet NXP 74HC4053 Datasheet Fairchild 2N3904
   Apr 30, 2026
7. Double-duty current loop transmitter
   Stephen Woodward
   Circuits Fairchild LM317
   .. contacts reliably? Woodward, Stephen. Silly simple precision 0/20mA to 4/20mA converter. Materials on the topic Datasheet Fairchild LM317
   Apr 15, 2026
8. Laser scanning microscope from Blu-ray player
   Doctor Volt
   Circuits Microchip MCP6004
   .. on the topic Datasheet Allegro A4988 Datasheet Texas Instruments L293 Datasheet STMicroelectronics L7805 Datasheet Fairchild LM317 Datasheet Microchip MCP6004 Datasheet STMicroelectronics BD677 Downloads OpenCV.js port of the ...
   Apr 1, 2026
9. A fully floating BJT-based LED current driver
   Luca Bruno
   Articles Fairchild BC550C BC557B
   .. with a negative temperature coefficient for R1 can partially compensate for this effect. Materials on the topic Datasheet Fairchild BC550C Datasheet Fairchild BC557B
   Apr 1, 2026
10. An LM317-based 0-20 mA to 4-20 mA 2-wire converter
    Ashutosh Sapre
    Circuits Fairchild LM317
    .. Reference Sapre, Ashutosh. Another silly simple precision 0/20mA to 4/20mA converter. Materials on the topic Datasheet Fairchild LM317 Datasheet STMicroelectronics BD140
    Mar 5, 2026

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