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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.

High Quality 150W Power Amplifier circuit

High Quality 150W Power Amplifier circuit using 2N3055, 2N2219, 2N3250 only with power supply – and + Short circuit protection, 94dB supply rejection ratio, thermal protection, S/N ratio in excess of 100dB, Open loop gain typically 90dB and 10A quiescent current, 2N3055, 2N2219, 2N3250 is great enough to give you good audio performmance. This power […]

Best portable headphone amp circuit

Best portable headphone amp circuit using LM833 or NE5532 High impedance headphones using : P1          22K R1         560R R2,R3 10K R4        12K R5,R6 2R2 R7        22R C1                   1µF 63V C2,C3,C4     100µF 25V C5                  22pF 63V C6                  22µF 25V IC1                LM833 or NE5532 Q1,Q3           BC337 Q2,Q4           BC327 Power supply parts: R8                                  2K2 C7,C8                            2200µF 25V D1                                   […]

Create an Electronic GPS to Monitor Earthquakes

Create an Electronic GPS to Monitor Earthquakes

Low Cost 36W Ballast circuit

Low Cost 36W Ballast circuit using IC IR2156

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