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Circuit diagram 75 Meter QRP SSB Transceiver

The 75 Meter QRP SSB Transceiver Theory of Operation 6-30-03 In general, the transceiver switches the 4-element 1500 ohm xtal BPF ends between the inputs and outputs of the two SA602s to reverse the signal flow for R/T operation. Since no IF amplifier is used in the design, 20 dB of additional receiver gain is […]

Electronic Circuit Ultrasonic motion detector using LM1458 – LM555

Electronic Circuit Ultrasonic motion detector using LM1458 – LM555 Electronic Circuit Ultrasonic motion detector using LM1458 – LM555 has several advantages and disadvantages. The main advantage is that they are very sensitive and very fast acting. However, the biggest problem with the type of motion detectors is that sometimes respond to normal environmental vibration that […]

Audio power amplifier circuit diagram using AN5265

Audio power amplifier circuit diagram using AN5265

3W Audio Amplifier Circuit using TA7230P

3W Audio Amplifier Circuit using TA7230P

NiMH Cell Battery Tester circuit

NiMH Cell Battery monitoring circuit NiMH Cell Battery Tester circuit using TLC555, 2222, ZXM61N02P

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