Symmetrical 15 V power supply (CB8498E)

Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V. The transistors are from that time.

| Clique na imagem para ampliar |

Card Lock (CB18122E)
This circuit safely replaces common locks, since, instead of the key, the opening is made with the...
High impedance differential amplifier (CB9837E)
Based on operational amplifiers of the time, this circuit from the 1980s has high input impedance. The...
Schmitt Trigger (CB221E)
Sine signals are converted into square signals by this simple circuit. The maximum frequency is...