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Posts tagged QRP,

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.

LDR Sensor Module

LDR Sensor Module for human body detection LDR Sensor Module for human body detection

Static Voltage Stabilizer circuit

Regulator Negative Bias Supply 424V to 600V DC, -42V DC

STK4171II Audio Amplifiers

STK4171II Audio Amplifiers STK4171II Audio Amplifiers circuit diagram STK4171II Audio Amplifiers This design is based on the 75 Watt Audio Amplifier, and was developed mainly to satisfy the requests of correspondents unable to locate the STK4171II STK4171II Audio Amplifiers

Head preamplifier circuit

Head preamplifier circuit using BC500c, BC550c

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