Found in a 1965 Electronic Design, this high voltage circuit uses period transistors. Its purpose was to excite Nixie display tubes common at the time.
We found this circuit in the National Semiconductor Linear Applications Handbook of 1994. The...
This is 4-input audio mixer using an integrated circuit 741 and two more operational amplifiers....
This shield circuit for controlling the direction of rotation of DC motors with current up to 500...