5-tube commercial radio (T1619E)

This commercial superheterodyne receiver was found in a 1949 Radio Electronics. The circuit uses battery.

Simple Stroboscope (CB24296E)
This incandescent bulb stroboscope was found in the February 1974 issue of Radio Electronics...
Phase shift oscillator (CB21806E)
We found this circuit in Mullard's 1960s transistor manual. The circuit oscillates at 800 Hz, the...
1 W Amplifier MFC8010 (CB20030E)
This amplifier uses an integrated circuit from the 70s, which is no longer common on the market. The...