This circuit was found in Radio Electronics from the 90s. The CMOS integrated circuit is a PLL not easy to obtain today. The output stage can be exchanged for another one with greater power.
This RS flip-flop uses two type 4N26 optical couplers and is characterized by the very high...
This circuit produces a sine 1 kHz signal. The frequency is given by C1, C2 and C3. This is a...
This circuit is a documentation of the 70's and therefore valid for analog lines. What the circuit...