Found in a 1947 publication, this 7-tube amplifier uses four tubes in the output stage. The circuit uses a power source with a transformer.
The RCA integrated circuit used in this control is uncommon today. The circuit is from an...
We found this circuit in a Popular Electronics of the 90s. The circuit uses a touch sensor formed by...
We found this circuit in a European schematic from the 90s. The used integrated circuit can still...