Automotive bargraph voltmeter (CB20661E)

Based on the well-known LM3914, this circuit was found in an old American documentation. Trimpots adjust the scale limits.

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Triangular generator (CB21445E)
Found in old documentation about neon lamps, this circuit produces very low frequency signals that...
Hartley Continuity Tester (CB11947E)
In the figure we show how to use a small Hartley oscillator as a continuity tester. The component...
Optocoupler Low Power Interface (CB15491E)
In the figure we have a interfacing circuit of TTL logic as CMOS logic using a 6N139 optical...