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Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Tom Williamson wrote ...
Just.. learn how it works inside out and dont kill yourself with it, a halfbridge can be more dangerous then a ZVS if used in the 'correct' way, i was really worried when you were saying how youve been getting electricuted by the ZVS i sold you... just stay alive
-Tom Williamson
I going to go halfbridge, if I die I die, which I wont....The ZVS you sold me was fail, I've made it alot better...
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Platinum wrote ...
... but I have basic understanding how 555 and halfbridges work...
I think not, or your previous circuits would be working well by now.
I dont want to discourage you, or be too harsh, but thats how i see it. Also you really need a O-scope for a full h bridge, the timing of the gate waveforms are pretty important.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
hi Platinum, a 555 has a voltage range of 3-18 rail voltage . take R4 and put it in series with the drain and ground your source same as pin 1 on the 555. you could try putting your uf4007 in series with R4 as I sujested or in parallel with the drain and source. I suspect that you are getting kickback from your coils. each one has a sertian amount of resonance so you want to turn your fet on for only 180 of that frequency. to do this you may want to convert your 555 to a straight oscilator and add a one shot and driver to the output for gate drive.
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Patrick wrote ...
Platinum wrote ...
... but I have basic understanding how 555 and halfbridges work...
I think not, or your previous circuits would be working well by now.
I dont want to discourage you, or be too harsh, but thats how i see it. Also you really need a O-scope for a full h bridge, the timing of the gate waveforms are pretty important.
When I said basic understanding, I meant it...
Yes I need a O-scope, but I don't have the money...
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
for something basic you could get one of those 1MHz color one chanel 100$ hand dso scope would get you over the hump. I also bought a old tecktronics scope for 100 on ebay
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
teravolt wrote ...
for something basic you could get one of those 1MHz color one chanel 100$ hand dso scope would get you over the hump. I also bought a old tecktronics scope for 100 on ebay
Yes, you can get a very nice tektronix scope for a fraction of the original cost. I bought a model 453 dual channel, dual trace portable scope for $160.00 a few years ago, and it's been one of my most valuable and most used pieces of test equipment.
I've heard mixed reviews of those little color pocket scopes. I never played with one, so I don't know how good or how bad they are, but in my opinion if you're going to spend that much money for scope, you would be better off buying a used American made tek or hp scope. Just make sure that the buyer gives you some sort of guarantee or right of return in case it doesn't work, or is in poor condition.
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Best arc I can get with 555
