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Posts tagged BC2121

Headphone amplifier diy circuit

Headphone amplifier diy circuit using BC2121, 2N3906, MJ480

LM555 circuit Pulse Detector part 6

LM555 circuit Pulse Detector part 6

Ultra-sonic sound processing with schema electronic audio

Ultra-sonic sound processing with schema electronic audio Parts List SEMICONDUCTORS —————————————————- IC1 567 phase-locked loop, integrated circuit U1 LM386 audio power amplifier, ic Q1, Q2 2N391M NPN transistor Q3 MPF102 JFET transistor RESISTORS (All fixed resistors are 1/4 watt, 5% units.) —————————————————- R1, R2 220,000 ohm R3-R6 2,200 ohm R7 1,000 ohm RS, R14 270 […]

STK4131II Audio Amplifiers

STK4131II Audio Amplifiers STK4131II Audio Amplifiers Circuit Diagram STK4131II Audio Amplifiers STK4131II Audio Amplifiers

Full-duplex Intercom PCB for your office and house

P1____    22K  Log. Potentiometer R1___     22K  1/4W Resistor R2,R3____ 100K  1/4W Resistors R4___     47K  1/4W Resistor R5_____   2K2 1/4W Resistor (See Notes) R6_____   6K8 1/4W Resistor R7________22K  1/2W Carbon or Cermet Trimmer R8_______ 2K7 1/4W Resistor C1,C6_____100nF  63V Polyester or Ceramic Capacitors C2,C3___ _10µF  63V Electrolytic Capacitors C4________22µF  25V Electrolytic Capacitor C5________22nF  63V Polyester or […]

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