High and low frequency signal generator

Published:2011/4/21 6:31:00 Author:Ecco | Keyword: High frequency, signal generator, low frequency | From:SeekIC

The high and low frequency signal generator shown as the chart can produce low frequency signal with 1kHz, IF signal with 465kHz and high frequency signal with 525 ~ 1605kHz, it can help debug on the radio or other circuit, and it is suitable for beginners. Transistor VTl ~ VT3: selecting 3DGl00, 3DG201 other high-frequency low-power silicon tube, fT> 100MHz, β value is between 50 to 100. C7 uses 7/270pF radio with double or a single connecting capacitor. Oscillation transformer T is restructured on the radio, the core uses a 0.08mm high strength wire with 100 turns and rolled on L1, 35 turns on L2. C8 uses 510pF mica capacitor. Q uses three-stage type of 465kHz IF ceramic filter. Sl uses DPDT switch type. Other values are ​​shown in Figure



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