- Published in issue 3/1998 on page 64
Flashing brooch optoelectronics in pocket format
This is the third and last in a series of three miniature designs for beginners in electronics. Each of the designs is powered by a 3 V lithium manganese dioxide nonrechargeable battery and is provided with some sort of visual indication. The brooch presented in this article is an elementary flashing circuit which has no pretensions other than that of an optoelectronic toy.