This circuit was obtained from an American 1980s documentation. The frequency depends on the crystal and the circuit may be a PNP that reaches the generated frequency.
This circuit consists of a control panel for motorcycles and cars monitoring various functions such as...
We found this CMOS circuit in a publication from the 1980s. What this circuit does is to flash two LEDs...
L1 is formed by 80 turns of wire 28 in a ferrite rod to tune medium waves range. The circuit can...