This traditional signal injector configuration was obtained in a 1977 amateur radio manual. The frequency is given by the capacitors and the supply can be made with 1.5 or 3 V.
This simple robot circuit was found in a Radio Electronics from the 90s. The components are...
In the figure we have the basic application of an LM3900 transconductance amplifier, as suggested by...
A fine adjustment of the output voltage of a power source is achieved with this circuit, which...