[Phil Allison[_3_]]

"John L Stewart"


** A " tone burst gate" is a very handy tool for *speaker* testing -
I built a kit version as published in ETI magazine ( ETI 124) about
30 years ago and it gets regular use. The circuit consists of just three
4000 series CMOS and two op-amps - plus a +/-15V psu.

Input can be any frequency from 5Hz to 50kHz.

If you have a copy of that ETI 124 schema


** No such luck, I would have tossed the relevant mag about 10 years back.

There is no archive of old ETI stuff and the copyright holders are "
Silicon Chip " magazine here in Sydney.

http://www.siliconchip.com.au/

I see no mention of that fact anymore.


..... Phil