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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 […]

3000W Inverter

3000W Inverter Parts list: R1=10Mohms R2=100ohms R3=1.2Kohms R4=560Kohms R5-6=2.2Kohms R7-8=56 ohms 5W CX=22pF trimmed capacitor C1-2=22pF ceramic C3=8.2nF 100V MKT c4=10uF 16V C5=47uF 16V C6=470nF 400V D1=5V6 0.4W D2-3=47V 1W Q1-2=BS170 Q3-4=BD139 Q5-6=BD249 IC1=4060 IC2=4013 IC3=4047 CR1=3.2768 MHZ crystal T1=220Vac/2X10V 2X2.2A F1=5A Fuse F2=0.25A Fuse L1=1H smoothing choke 1. Advanced Energy Flow Management for lowest […]

20 w Amplifier stereo circuit

20 w Amplifier stereo circuit using TDA 2004 Amplifier stereo circuit using TDA 2004 R1 120K Ohms R2, R4 1K Ohms R3, R5 3.3 Ohms R6, R7 1 Ohms C1, C2 2.2µF C3 10µF C4, C6 100µF C5, C7 100µF C8, C9 0.1µF C10, C11 1000µF TO 2200µF CI TDA2004A it is a circuit integrated […]

555 timer MCT2E opto-coupler

The main components used are 555 timer MCT2E opto-coupler The main components used are 555 timer MCT2E opto-coupler

Simple Ohmmeter Driver circuit

Simple Swr Avometer Driver circuit Synthetic Isolators, great for checking the SWR of antennas

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