Ammeter (CB9660E)

This current meter with many scales was found in a 80s American documentation. The operational amplifier is from that time, uncommon nowadays.

| Clique na imagem para ampliar |

Shortwave receiver (CB21636E)
This transistorized receiver was found in Popular Electronics from February 1968. Transistors are...
Sequential Whistler (CB16611E)
This sound effect circuit was found in a 1987 publication. It is a circuit that drives a set of...
Current to Voltage Converter (CB14604E)
The circuit shown is from 1997 Linear Technology Applications. The components used were common at the...