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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.

Model Police Car Siren circuit

Model Police Car Siren circuit using 9013, 9012 R1 ………….. 6,8K ohm R2 ………….. 2,2K ohm R3 ………….. 100K ohm R4 ………….. 15K ohm R5 ………….. 1K ohm R6 ………….. 470 ohm VR ………….. 1K ohm C1 ………….. 4,7uF – 10V C2 ………….. 0,068uF – 25V TR1 …………. P.U.T. MEU – 21 TR2 …………. FCS […]

20W Audio Amplifier Circuit using TDA1552Q

20W Audio Amplifier Circuit using TDA1552Q

Wireless Systems Using Aurel RX FM

Portable PA System with Wireless Microphone using wireless systems circuit diagram Component 1: R1 100 Ω        C1 100 µF 25V     D1 1N4007 R2 5.6 kΩ       C2 10 µF 16V        T1 BC547 R3 470 kΩ     C3 220 nF              U1 Aurel TX FM […]

Guitar amp preamp

Guitar amp preamp using BC546 and BC556 Guitar amp preamp using BC546 and BC556 P1_________________ 10K   Linear Potentiometer P2_________________ 10K   Log. Potentiometer R1,R2______________68K   1/4W Resistors R3________________680K   1/4W Resistor R4________________220K   1/4W Resistor R5_________________33K   1/4W Resistor R6__________________2K2  1/4W Resistor R7__________________5K6  1/4W Resistor R8,R18____________       330R   1/4W Resistors R9_________________47K   1/4W Resistor R10________________18K   1/4W Resistor R11_________________4K7  1/4W Resistor R12_________________1K   1/4W […]

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