Single Crystal Filter (CB6542E)

High selectivity filters can be obtained by combining same frequency crystals in series as shown in the circuit.

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Power grid Transmitter (CB25181E)
This circuit was found in the January 1989 issue of Radio Electronics magazine. The circuit sends...
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We found this TTL power supply circuit in the December 1972 issue of Radio Electronics magazine. The...
High quality tone control (CB20805E)
This circuit was found in an American documentation from the 1980s. The sensitivity ranges from...