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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 […]

Making inverter 3000w 12v DC – 220v AC for car

Making inverter 3000w 12v DC – 220v AC for car

Midi Interface

Midi Interface audio circuit mixer

Engineering Tools – Timbangan digital circuit

Engineering Tools – Timbangan digital circuit using 555

Circuit can be used for multiple Camera – Switch to monitor

Circuit can be used for multiple cameras with one monitor. The circuit can be operated manually or automatically. When operated automatically the switch will be connected to the output of 555 astable multivibrator that will send a continous square wave in the 4017 counter. When counter is running, the 5 transistor will switch one by […]

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