Level Indicator (CB4890E)

This 3-step level indicator uses only passive components. LEDs are common and trimpots can be 4k7 which a current commercial value.

NiCad Battery Automotive Charger (CB4978E)
This small automotive NiCad battery charger uses only passive components and has the number of...
3-Tone Oscillator (CB3848E)
This traditional complementary circuit produces three different ones, adjusted in the...
Product Detector (CB4223E)
Found in a 1980s publication for amateur radio, this circuit employs an MC1596G which is a...