12-21-2013, 04:15 PM
Hi
Just been checking frequencies, with the design above it is 78Hz, this compares favourably with my simulation (84Hz). I must have misread my initial measurement. Thanks for the information on Mallory vibrators (will make good Christmas reading), after a bit of playing with values, my model shows a that if the two 820 Ohm resistors are changed to 620 Ohms then the frequency should be 118Hz, after a quick mod a frequency of 102Hz was measured.
Will have to make a few more checks as current is a tad high, time to check for more leaky caps (need to check the single can that holds 4 paper caps). More to follow after the Christmas break
Cheers
Richard
Just been checking frequencies, with the design above it is 78Hz, this compares favourably with my simulation (84Hz). I must have misread my initial measurement. Thanks for the information on Mallory vibrators (will make good Christmas reading), after a bit of playing with values, my model shows a that if the two 820 Ohm resistors are changed to 620 Ohms then the frequency should be 118Hz, after a quick mod a frequency of 102Hz was measured.
Will have to make a few more checks as current is a tad high, time to check for more leaky caps (need to check the single can that holds 4 paper caps). More to follow after the Christmas break
Cheers
Richard
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