Signal generator (CB21057E)

Found in Popular Electronics, this '90s circuit generates harmonic-rich signals for testing audio equipment.

Pulse Width Modulator MC1455 (CB14587E)
The integrated circuit used in this application is like the 555. The components depend on the...
High Impedance Probe (CB6454E)
Originally suggested by Electronic Design in a 1965 documentation for use with oscilloscopes, this probe has...
Power Supply (CB20137E)
This power supply has been suggested for powering a meter with Numitron-type valves, which are...