164 V neon regulated power supply (CB8666E)

Found in a 1969 neon lamp publication, this circuit provides two voltages under very-low currents. Neon lamps are types of the time.

| Clique na imagem para ampliar |

Going Astern Alert (CB4774E)
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...
Alarm and current sensor (CB5285E)
This circuit is from Linear Technology 2005 documentation. The circuit is based on company...
15 V x 1 A power supply uA723 (CB19023E)
The integrated circuit used in this power supply is no longer very common in power supplies today....