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Posts tagged 国家统计局

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.

Making VCO for MF-HF-VHF

It is a simple Colpits oscillator, but it has a 78L05 5v regulator (not shown) as the supply feed. The 22K and 33K resistors bias TR1 emitter to about 3v DC, which means that TR1 emitter can feed the CD4040 counter input directly when the synth is fed from a 10 volt supply. This is […]

Simple Shunt Reg Circuit

Simple Shunt Reg Circuit

Making Magnetic stripe reader

Making Magnetic stripe reader circuit using BD328 Making Magnetic stripe reader circuit using BD328 Making Magnetic stripe reader R1,R3 1M 1/4W Resistors R2,R4 47K 1/4W Resistors R5 330K 1/4W Resistor R6,R7 68K 1/4W Resistors R8 180R 1/4W Resistor R9 100R 1/4W Resistor C1 470pF 63V Ceramic Capacitor (See Notes) C2 10nF 63V Polyester or Ceramic […]

Making USB using RS232 converter

Making USB using RS232 converter works really well with all the devices I tried. USB to RS232 converter can also use FT8U232AM and Maxim-IC MAX235 If no FT8U232AM, could also use TTL level RS232 signals. The FT8U232AM and supporting components are also available as a complete module – called USBMOD1 – in 32pin DIL IC […]

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