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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.

Audio Recorder Circuit

Audio Recorder Circuit using LM324, PIC16F84A, ULN2803A, 1N4148, 2N3904

Transmitter circuit schematic with MC2833 delivers up to 3W

Transmitter circuit schematic with MC2833 delivers up to 3W It is capable of operation over about 29 to 32 MHz with the components shown. A 27MHz NBFM transmitter circuit schematic with MC2833 and 2 FEET transistors MPF6660. Using a Motorola MC2833 one-chip FM transmitter, a few support components and am MPF6660 RF amp, this transmitter […]

Battery Charger circuit

Battery Charger circuit using LM317, BC548

stk ic

stk ic circuit using STK015 stk ic circuit using STK015 stk ic R1 …….. 10K R2 …….. 1K5 R3 …….. 47 R4 …….. 10 R5 …….. 220 C1 2 …… 1uF/50V C3 …….. 3.3uF/50V C4 …….. 47uF/25V C5 …….. 33uF/16V C6 …….. 47uF/10V C7 …….. 33uF/ 50V C8 …….. 1000uF/50V C9 …….. 473 IC …….. […]

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