Hi Bob,
Arduino just arrived - I'm playing around with it and my Douglas Randal SSR.
So first of all, I have to say - I've been an idiot for not trying this sooner! I mean come on a 10 dollar cap dump that takes sooooo much effort out of the work I've been doing for sooooo long!
I'm using the long sketch you listed earlier in this thread HERE. I'm letting the charge in two 3300 uf paralleled caps get to 35-45V it varies because of the timing on the sketch.
I'm using a big fat diode on the negative side before the SSR so between the cap and the SSR.
I'm using fat "monster cable" speaker wire from the caps to the charge batteries.
I can not get the high voltage spikes to show up in the dump. I think we also have the same Radioschack Voltmeter the spikes are not showing up there or on my scope. Here is a vid showing my monster mess. I know it needs some cleaning up before the caps, but from the caps to the charge batteries it's fairly clean.
other things I have tried:
1. just one 3300uf cap
2. IRFP260N with the 10k ohm resistor as to ensure shut off
3. MJL21194 NPN
4. simple PWM sketch from your vid 7200MS low 1800MS high
Each of these trigger nicely and work perfectly, just no spike, no spike at all only the voltage dropping across the charge battery. I've ran the trigger as fast as 2microseconds using npn, fet and the ssr each trigger and close just fine.
Any thoughts are much appreciated.
Have you used other diodes on the neg side of the dumping, or always the one?
Maybe your caps?
BTW, if you ever want to see what a particular sketch looks like on the scope, just post it and I'll run it for you.
KR - Patrick
Arduino just arrived - I'm playing around with it and my Douglas Randal SSR.
So first of all, I have to say - I've been an idiot for not trying this sooner! I mean come on a 10 dollar cap dump that takes sooooo much effort out of the work I've been doing for sooooo long!
I'm using the long sketch you listed earlier in this thread HERE. I'm letting the charge in two 3300 uf paralleled caps get to 35-45V it varies because of the timing on the sketch.
I'm using a big fat diode on the negative side before the SSR so between the cap and the SSR.
I'm using fat "monster cable" speaker wire from the caps to the charge batteries.
I can not get the high voltage spikes to show up in the dump. I think we also have the same Radioschack Voltmeter the spikes are not showing up there or on my scope. Here is a vid showing my monster mess. I know it needs some cleaning up before the caps, but from the caps to the charge batteries it's fairly clean.
other things I have tried:
1. just one 3300uf cap
2. IRFP260N with the 10k ohm resistor as to ensure shut off
3. MJL21194 NPN
4. simple PWM sketch from your vid 7200MS low 1800MS high
Each of these trigger nicely and work perfectly, just no spike, no spike at all only the voltage dropping across the charge battery. I've ran the trigger as fast as 2microseconds using npn, fet and the ssr each trigger and close just fine.
Any thoughts are much appreciated.
Have you used other diodes on the neg side of the dumping, or always the one?
Maybe your caps?
BTW, if you ever want to see what a particular sketch looks like on the scope, just post it and I'll run it for you.
KR - Patrick
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