This variable frequency oscillator for radio transmission covers the range from 1.6 MHz to 20 MHz, depending only on the coil used. The circuit is very stable and can be used in amateur equipment.
This relay circuit was found in a 90s American documentation. The transformer windings are...
The indicated circuit is an intermittent one in which we use two 555 integrated ones, one as a low...
Found in documentation from the 1980s, this circuit uses an operational amplifier from that time....