Solar charger MC34064 (CB14537E)

The integrated circuit used in this charger is not very common today. The circuit is from Motorola's 1990 Linear Databook.

Audio Oscillator (CB21961E)
Suitable for general use and alarms, this Hartley oscillator circuit from a 1960's Gernsback...
Logic Probe (CB8906E)
Found in a 90s Popular Electronics, it serves both TTL and CMOS logic. The injector can provide 10...
Second-order bandpass filter (CB25598E)
This filter with the operational 741 passes the frequency range between 300 Hz and 3,400 Hz. This...