Moderators: Dave Moll, Andrew Davie, Steve Anderson
Viewmaster wrote:the main problem is that each mono vib has innacuracies in the timing due to RC changes with tempereature etc..
Steve Anderson wrote:Viewmaster wrote:the main problem is that each mono vib has innacuracies in the timing due to RC changes with tempereature etc..
Albert I think you're worrying about timing drift with temperature a little too much. If a a metallized Polyester film capacitor (PET) and a metal-film resistor were used for the timing components the change in pulse length is likely to be a lot less than 1% over normal room temperatures.(10-30 Celcius).
The low resistance (as a percentage) 'framing' pot would also allow adjustment for this.However this method does require a reasonably close to 400Hz line-rate.
Viewmaster wrote:Shouldn't the 4024 counter be allowed to count 31 line pulses, which is 77.5ms, before being reset?
Steve Anderson wrote:It was an idea some time back and stored in my head which has many bad sectors.
Steve A.
Viewmaster wrote:Y.....and Sylvia Peters
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