10 MHz counter (CB20128E)

This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a selectable output.

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Triac Control Shield (CB4247E)
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Simple LED VU (CB18060E)
VU or Volume Units is a sound intensity indicator that can be installed on any stereo. The...
10 Hz Low Pass Filter (CB1465E)
This circuit was originally designed for medical applications and biological experiments. The...