6W amplifier with TDA2613 2 (CB15394E)

This circuit uses a simple power source, having been found in the Philips Databook of 1990. Information on performance is given in the table below.

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200 MHz crystal oscillator (CB9619E)
This circuit was found in a1980s Motorola documentation. The integrated circuit is from that time....
Voltage indicator (CIR22154E)
This circuit is a variation of the previous one, indicating a voltage range, for example 11.5 to...
High impedance buffer (CB9557E)
This circuit was obtained in a 90’s American documentation. The FET can be replaced by a modern...