Model contol (CB22185E)

This miniature railway control circuit was found in an English documentation from the 1980s. The integrated circuit is an operational amplifier.

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Temperature Controller (CB6016E)
We find this circuit in an American 80's documentation. It makes use of IC sensor which is mounted...
TTL Interface Shield (CB19757E)
This is a configuration obtained from an old manual, using an operational amplifier of the time....
Operational with Hysteresis LM309 (CB15103E)
In the figure we have the way to add hysteresis to an operational amplifier. The relationship...