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 |

Preselector with JFET (CB9170E)
This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
Octave equalizer (CB7978E)
Found in Precision Monolithics documentation from the 90's, this circuit equalizes octave signals...
Field strength meter (CB7564E)
This circuit that appears in similar versions on this site was found in a Popular Electronics from the...