Ammeter (CB9660E)

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

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Two-Band Radio (CB16394E)
This circuit in a receiver that allows the capture of distant stations with short waves. The...
LM386 Amplifier with 741 Preamplifier (CB1003E)
This simple circuit of low power with an LM386 includes the highly sensitive audio preamplifier...
Voltage Regulator (CB5869E)
This circuit is from old documentation but can be applied to modern equivalent components. The...