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Posts tagged metering

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.

Electronic circuit diagram Low distortion audio amplifier Using LA4282

Electronic circuit diagram Low distortion audio amplifier Using LA4282

power supply Circuit diagram

+15V -15V power supply Circuit diagram with ic 78xx and 79xx, 7815, 7915, BC549

PRE AMP MIC

PRE AMP MIC 3 TR USING BC550C BC556 BC546 PRE AMP MIC 3 TR USING BC550C BC556 BC546 R1_____________ 1K5 R2_____________ 220K R3_____________ 18K R4_____________ 330R R5_____________ 39K R6_____________ 56R R7,R10_________ 10K R8_____________ 33K R9_____________ 150R R11____________ 6K8 R12,R13________ 100R R14____________ 100K C1_____________ 220nF 63V C2_____________ 220pF 63V C3_____________ 1nF 63V C4,C7__________ 47µF 50V C5,C6__________ […]

Tube Amp using EL34

Tube Amp using EL34 35W Electronic Parts R1=470K 0,5W R13-21=820K 0.5W R12-23= 180K 0.5W R2-5= 2K2 0.5W R14-22=5K6  0.5W R3=150K 0.5W R15-20= 680K 0.5W R4= 220K 0.5W R16-19=100K 0.5W R6-10= 56K 0.5W R17-18=3K3 1W R7=3.9K 0.5W R24=470R  2W R8= 220R  0.5W R9= 1M  0.5W R11= 39K 1W C2=220pF 600v C8-9=0.1uF 630V C10-14=0.47uF 630V C4-5=16uF 550V […]

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