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Thursday
Oct312013

Readers' prototypes

Following the intermittent appearance of my ‘potted history’, regular reader and friend of EPE Thomas Stratford got in touch to say that he’d built a couple of my legacy projects! These photos show Thomas’s Uniboards Touch Switch and more recently, the Continuity Test Unit.

The touch switch is a simple but very effective Darlington transistor design that relies on finger resistance to toggle a relay. The design would benefit from a proper p.c.b. with a pattern for the touch pads.  The Continuity Test Unit originally used some metal touch-switch pads from Maplin, which I used as contacts for testing fuses easily.  You can download the original circuits via my ‘Interview’ web pages.

If you've tried any of my projects it would be great to hear from you.

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