I remember making one of those at Forbs Trail Vo Tec.
It works just about identically to a .......what is it's name...commercial
unit.

PP

"Jeffrey D Angus" wrote in message
...
Based on this:
http://octopus.freeyellow.com/octopus.html

I built this:
8 cm x 13 cm x 4 cm project box with a 12.6 VAC transformer

The display on the Tek 422 scope is a 9.1 V zener diode,
1N3019, showing both the forward and reverse conduction.

I set the voltage range switch for 0.3, 1.0, 3.0, 10 & 30 Vp-p.

Jeff

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