1 2many wrote:OzKev wrote:1 2many wrote:Thanks fellas for your input, I should of mentioned I plan to use PWM to control the ssr's for a linear slope on the output and planed on a 1 Hz cycle then I thought that would give a lot of needle bounce anyone suffer this issue. :-B I still think analog might be first choice . :handgestures-thumbupleft:
if you are going to use a SSR why not just grab one that supports resistance, then all you need is a simple pot is needed to control it?
Well I already have 2 x pmw's and 2 x voltage triggered ssr's and was under the impression that the resistance type worked mainly at one end of the pots range.
That would depend on the resistance of the SSR Vs the pot. ie if you used a SSR designed for 500K ohm, with a 1000K ohm pot you would have minimal pot movement to do a lot of adjustment on the output, but if you had a 350K ohm pot you would have to turn it a lot more to change the voltage. I'm running mine with a 680K ohm pot (what was on hand) and can easily adjust the output within a couple of Volt increments.
At the end of the day, both methods should work great :handgestures-thumbupleft:
I'm just not 100% sure using PWM if the analogue gauge will show a smooth output, I think it should. $US 5.99 I'd give it a try, just dont cut a hole in the box for the gauge until you tried it.