Tunnel Diode Amplifier (CB22542E)

This amplifier circuit is from a 1952 documentation. The frequency of the amplifier signal depends on the coils. Note the low supply voltage.

Electronic Dice (CB12221E)
This TTL dice is from an old publication from 1978, but it can still be assembled, as the...
Full wave rectifier (CB9455E)
This precision signal rectifier was found in an Electronic Design. The components used are from...
OR gate LM3900 (CB14200E)
We found this setting in the National Semiconductor Linear Applications Handbook. The base is an...