Code practice oscillator (T380E)

This oscillator was found in the 1961 RCA tube manual. Similar configurations appear on this site for manuals from other times by the same company.

Stepper Motor Control (CB1587E)
The MC1413 ULN2003 integrated circuit consists of a 7-bit step motor control, with 50 V x 500 mA...
Two Light Flashers (CB947E)
The circuits below were found in amarican publication of the year 1958. The transistors are...
Transformerless 12V x 50mA Power Supply (CB4564E)
We found this circuit at a January 1991 Modern Electronics. The magazine no longer exists, but the...