Electronic schematics, circuit designs
Audio compressor SSM2165
A very simple audio compressor built with SSM2165 IC. There is no much explication about this compressor circuit schematic, just pay attention at capacitors voltage. The C8 value depends of your desired frequency amplification. Mount 7805 on a heatsink if you use higher voltages.
Audio compressor circuit components:
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Crystal quartz oscillator
Another great quartz crystal oscillator schematic with bb139, a 2-nd harmonic quartz crystal and one BF214 transistor. So, the Q quartz is half of the desired transmitter frequency, L1 has 24 turns, 0.08mm Ø built on a 455kHz carcase. L2 has 8-9 turns / 0.8mm Ø / 5mm Ø. This quartz oscillator circuit has a great frequency stability, I’ve build it.
Crystal quartz circuit components:
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Quartz crystal oscillator
A very simple crystal quartz oscillator circuit schematic which use a quartz for frequency stability and a good rf tranzistor. Use a 2-nd or 3-rd harmonic crystal , for example if you want 100MHz use a 50MHz or 33.3MHz quartz or if you want use a 4-th harmonic crystal but the output rf voltage will be lower. The L coil has 5 turns 0.8mm Ø , 6mm Ø , 1 mm step, output at first turn from + . Use C4 for fine frequency adjustments. For a great frequency stability, this quartz oscillator circuit must use a good varicape diode ( you can use bb139 ) .
Quartz oscillator circuit components:
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