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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.

Filter for Headphone AMP schema

3KHz Low Pass Filter for Headphone AMP schema using LM368, MF6-50 Headphone Amplifier Schematic I built a portable headphone amplifier for testing purposes. Each channel uses a single Burr-Brown LM368, MF6-50 opamp in inverting configuration. It has adequate current capability to drive most headphones without an output stage. I have used it with Sennheiser 465s […]

5W Audio Amplifier Circuit using TA7252P

5W Audio Amplifier Circuit using TA7252P

DTMF TOUCHTONE GENERATOR

DTMF TOUCHTONE GENERATOR DIP16 TCM5089N DTMF TOUCHTONE GENERATOR DIP16 TCM5089N

LM555 Microcontroller Circuit TIMER part 22

LM555 Microcontroller Circuit TIMER part 22

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