Sequential LED (CB7860E)

The UAA170 integrated circuit is not very common today. This project is for a 303 Circuits from the 90s. The power supply is 12 V.

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Adjustable High Q Notch Filter (CB15815E)
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Simple Stethoscope (CB18347E)
This stethoscope or amplifier for hearing aid using a crystal headset and microphone was found in a...
Divide-by-16 Counter - 4520 (CB176)
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