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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.

Headphone amplifier ic

Headphone amplifier ic circuit using TL072, BD139, BD140

LEVEL METER DRIVER

7 DOT LEVEL METER DRIVER Audio circuit using KA2288 7 DOT LEVEL METER DRIVER circuit using KA2288 The KA2288 is a monolithic integrated circuit consisting of 7-dot LED level meter drives.  KA2288 employs a low noise comparator which provides 10dB lower noise in the LW, MW band than the previously mentioned LED drivers. FEATURES LED […]

Touch switch project

Touch switch project using 4011, BC557

Electronics Circuit Programmable LED light

Electronics Circuit Programmable LED light circuit diagram flashing LED that, after a preset number of flashes will illuminate steadily until P1 Reset Parts: R1______________10K 1/4W R2_______________1M 1/4W R3_______________1K 1/4W C1_______________4µ7 25V C2______________10nF 63V D1___________1N4148 75V 150mA D2______________LED IC1____________4060 B1______________3V to 15V Battery

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