This simple Morse Code oscillator was found in a 1980s American documentation. The power supply should be powered with 5V and the integrated can be the 7400.
This circuit controls a heating element using a triac. Triac must be fitted with a heat sink. We...
Found in a 90s Popular Electronics, this circuit is intended for amplifying analog video signals....
We found this circuit in a 1977 technical documentation. The FET can be the BF245 and the bipolar...