Joe, what I am thinking is to filter the pulses to DC to control the LED brightness. A scope would be of great help so you can look at the opto s input. YouMessage 1 of 4 , Jun 19View SourceJoe, what I am thinking is to filter the pulses to DC to control the LED brightness. A 'scope would be of great help so you can look at the opto's input. You may find a small resistance or even an inductance with the cap on the input side will help. I think you need to change the pulses to DC. If there is too much loss from the filtering you may need a transistor amplifier with the filter on its output.Lots of Luck!Paul, W8IQE----- Original Message -----From: Joe VeldhuisSent: Wednesday, June 19, 2013 4:52 PMSubject: Re: [WestMichiganHams] Re: ICs that convert PWM to continuous voltage/current?
I tried a few caps (from 20 pF to 1 uF), but it didn't seem to help.
On Wed, 19 Jun 2013 07:28:35 -0400
"Paul E. Zellar" <paulzellar@...> wrote:
> Joe, have you tried adding some capacitance to the optocoupler input?