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Schematic diagram for a broadband QRP SWR metering circuit and SSB TRANSCEIVER 80M / 40M boster filter IF Radio

A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light.

Phone Broadcaster and Telephone Circuits

Here is a simple yet very useful circuit which can be used to eavesdrop on a telephone conversation. The circuit can also be used as a wireless telephone amplifier. One important feature of this circuit is that the circuit derives its power directly from the active telephone lines, and thus avoids use of any external […]

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

Integrated amplifiers

Integrated amplifiers using stk439 Integrated amplifiers using stk439 Integrated amplifiers R 1 ……….. 2 K 2 R 2,4 ……… 220 K R 3 ……….. 390 K R 5 ……….. 100 R 6 ……….. 120 R 7 ……….. 12 K R 8 ……….. 10 C 1 ……….. 470 pF C 2 ……….. 100MF/50V C 3 ……….. […]

LM339 IC for Voltage Detector and Circuit Diagram

LM339 IC for Voltage Detector and Circuit Diagram

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