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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Mini Timer (CB17380E)
This timer up to 2 hours was found in a documentation of the year 2000. It uses only bipolar...
Modulated Siren 555 CMOS (CB15866E)
In the figure we have a modulated siren circuit that excites a loudspeaker with good power. If the...
Three Phase Generator (CB1446E )
With this circuit it is possible to generate 3-phase rectangular signals from a clock signal. The...