11 Jul
2007
11 Jul
'07
11:02 a.m.
On 11 Jul 2007 at 6:40, dwight elvey wrote:
We certainly could use a vacuum triod--as long as we took care to
select one with a sufficient heater-cathode breakdown voltage rating
or provide a separate heater winding on the power transformer. This
was often a problem even with vacuum timebases, such as the Puckle
circuit. The most clever non-gas sawtooth generator I've ever seen
was the Miller circuit that used the same pentode as both a constant-
current source and an oscillator.
I know it was not at all uncommon to use a JFET as a simple constant-
current supply for a UJT relaxation oscillator.
Cheers,
Chuck
Hi Chuck
Ok, are we allowed to use a vacuum triode? Using high voltage
to help linearize the saw tooth seems to be the sledge hammer
method.