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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.

Adjust the Layout of Components on PCB

Adjust the Layout of Components on PCB The layout of a PCB can be very important so I always lay the components out as they are in the circuit diagram to begin with. Instead of circuit symbols I draw the component pins. The drawing is made with a pencil on 1/4″ squared paper. The compnents […]

Power Shutdown Circuit For LDO Regulator

Power Shutdown Circuit For LDO Regulator using LP2954

1500W UPS circuit

1500W UPS circuit using IC LC3524, IRFZ44 1500W UPS circuit using IC LC3524, IRFZ44

Headphone amplifier ic

Headphone amplifier ic circuit using TL072, BD139, BD140

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