On 2/10/2014 12:44 PM, Tidak Ada wrote:
Hmm could be, but despite I have heard about it, I am not familiar with the
Phamtastron circuit. Does it deliver a sine or an block/pulse at the output?
I have to look for some clear theory.
eric
Eric,
Google does not help with the Phantastron, as someone borrowed the name for a
product.
The circuit is also called a Miller sweep circuit. It is used in oscilloscopes,
and in old digital pulse circuits as a frequency divider. A pentode tube
generates a sawtooth wave, and is triggered to reset by a synchronizing signal
only when near the end of the sweep.
Look at any old HP frequency counter for a decimal divider using the
Phantastron. They were also used in early television sync generators. This is
why the old television line count was a product of small numbers such as the
US 525 line TV: 525 = 5 * 5 * 7 * 3.
--David Forbes
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