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Posts tagged 水晶

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 […]

Constant high current regulator – circuit modules

Constant high current regulator – circuit modules using BD140, 555, 3041, BC546, 4060 Constant-Voltage Constant-Current Battery Charger – BD140, 555, 3041, BC546, 4060

40 – 0 – 40 5A transformer Circuit diagram

40 – 0 – 40 5A transformer Circuit diagram The power supply should be capable of supplying the maximum current required with good stabilization. I used commercially available 40 – 0 – 40 5A transformer. The transformer have 6V, 9V, 12V and 22V windings also. The transformer cost me around Rs: 370. Power supply provides […]

Converter PDF circuit

Converter PDF Converter PDF circuit

PC serial port RS-232 pin out and wiring

PC serial port RS-232 pin out and wiring

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