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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 […]

Circuit Diagram Converter trigger signal causes the 555 to discharge the capacitor for synchronization

LM1881 is used to do all the grunt work of separating the sync signals from the composite video. The chip provides the vertical sync on pin 3 for the vertical oscillator, and composite sync on pin 1 for the horizontal oscillator. The intensity signal comes from the composite video signal itself, but is negative. I […]

Home theater speaker wire installation

Home theater speaker wire installation Schematic Audio Car Honda CRV jvc AVX900 Home theater speaker wire installation Car speaker installation guide, Schematic Audio Car Honda CRV jvc audio car Home theater speaker wire installation

Simple Touch switch schematic

Simple Touch switch schematic using 4011

PCB Booster tube and light flow control valves using 12AU7

PCB Booster tube and light flow control valves using 12AU7 A 12AU7-based booster and light overdrive running at 9 volts.  A very fun little circuit that has a minimal parts count and actually generates a good amount of boost and some overdrive. You can even run this one of a 9 volt battery if you […]

Audio hi fi booster circuit

Audio Crossover Circuit using Switch ON / Switch OFF . Audio hi fi booster circuit ,Voice will be smaller when the IC TL072 not Enable or switch “OFF“ Hi–Fi Audio Power Circuit Diagram

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