Pickup Coil Charges a Cap Above Battery Voltage — Ainslie

909 views · Published 28 July 2009 · 4:23 · Indexed 20 September 2026

Channel: Aaron Murakami · 2009 · Science & Technology

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A coil bent over the inductive resistor of the Rosemary Ainslie circuit produces about 30 to 33 V DC through a full-wave bridge with nothing connected to it, and is used to charge a capacitor feeding the front of the 555 timer circuit through an isolating diode. Meters show the cap sitting at 8.29 V against a 7.91 V timer battery, about 0.4 V above it, so the battery cannot be charging the cap. A 2200 uF 50 V capacitor is then fitted in place of the smaller one.

Chapters
0:00 Pickup coil over the load resistor
1:48 Cap measured above battery voltage
3:19 Swapping in a 2200 uF cap

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Rosemary Ainslie COP 17 circuit, 2009 bench footage. Posted 2009-07-28.

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