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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Basic Voltage Comparator C (CB25867E)
This circuit uses an LM339 and was found in the July 1995 Electronics Now magazine. The LED lights...
555 Car Alarm (CB3990E)
We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit...
Photodiode Current to Voltage Converter (CB6104E)
This circuit was obtained from an 80's documentation from General Electric. The circuit uses an...