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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.

Bass power amp

Bass power amp using MJL4281, BD139, BC559

Electronics Circuit clock displays and clock timing for single board computer

Electronics Circuit clock displays and clock timing for single board computer The Clock Controller was designed to be an exemplary of using control timer 0 interrupt, 7-segment LED and keypad scanning. It provides 1-bit sink current driving output, for driving a relay, opto triac, say. Many projects requiring7-segment display and keypad interfacing may get the […]

Touch switch circuit using Relay

ON off Touch switch circuit using 12v Relay R1 ……………. 220K R2 ……………. 47K R3 ……………. 4,7K R4 ……………. 10 M FET …………… 2N3819 TR1 …………… FCS9012 TR2 …………… FCS9013 Relay …………. DC – 12V

SCR Transistor Tester circuit

SCR Transistor Tester circuit SCR Transistor Tester circuit

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