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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 30th December 2011, 12:04 PM   #2281
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by Salas View Post
Can the capacitors be too heavy kicking high spikes?
That's a real possibility so working with quanghao pcb

I left only 220uF psu & only 150uF reg: 47R + 220R + all LED's burned.

Changed 47R, 220R, all LED's, IRF9610 & SK170BL: LED's don't lit but when conect a 9V battery all LED's lit. After a moment powered the 220R gate resistor IRF9610 again burned also all LEDs burned.

Now all testing with a dummy load 15K 10W connected, always 0Vout.

Attached quanghao schematic & some pics of the assembled board
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Old 30th December 2011, 12:32 PM   #2282
AndrewT is offline AndrewT  Scotland
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The LEDs should be OK. They are in series with R3 which limits the current.

I am not so sure what happens to Q4 during start up?
Similarly Q1 takes a big hit during start up.

I cannot see why the LEDs fail if you have assembled the circuit correctly. Did Q1 fail first and take out R1 and then bypassed R3?
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Old 30th December 2011, 12:35 PM   #2283
Tea-Bag is offline Tea-Bag  United States
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Simplistic Mosfet HV Shunt Regs
So this sounds to me like LED's are in backwards. Seen that before in other builds, my builds etc.
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Old 30th December 2011, 01:10 PM   #2284
merlin el mago is offline merlin el mago
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I desoldered R1 56R & it's broken: 0 ohms. So I solder I new oneto see what's happen.
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Old 30th December 2011, 01:56 PM   #2285
iko is offline iko  Canada
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Simplistic Mosfet HV Shunt Regs
Every time a component goes it's highly likely it will take a few others with it. At this point you might want to test every transistor in the circuit to make sure they're ok.
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Old 30th December 2011, 02:12 PM   #2286
merlin el mago is offline merlin el mago
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Thanks Iko, I will follow your good advice.
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Old 30th December 2011, 04:00 PM   #2287
AndrewT is offline AndrewT  Scotland
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Merlin.
I think your have read your ohmmeter wrongly.
0.1 or 0.2 would indicate a short circuit.
0.L indicates overload. This is equivalent to open circuit, i.e. the screen cannot display a high enough value for the resistance it thinks it is measuring.
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Old 30th December 2011, 04:02 PM   #2288
merlin el mago is offline merlin el mago
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Changed all semis + 56R adjust current resistor + 220R gate resistor IRF9610, LED's still don't lit, LED's tested with 9V battery and lit positive side connecting current adjust resistor and negative side connecting 100uF + 56K + 220R gate resistor IRF9610
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Old 30th December 2011, 04:05 PM   #2289
Salas is offline Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Is R3 56K 5W? Measure Ohm across it with the reg off.
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Old 30th December 2011, 04:08 PM   #2290
merlin el mago is offline merlin el mago
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Quote:
Originally Posted by AndrewT View Post
Merlin.
I think your have read your ohmmeter wrongly.
0.1 or 0.2 would indicate a short circuit.
0.L indicates overload. This is equivalent to open circuit, i.e. the screen cannot display a high enough value for the resistance it thinks it is measuring.
Thanks AndrewT,

I understood correctly that the resistor measured have a high impendance at least morethan my DVM can read so the resistor isn't shorted it's open without any contact so that's the reason my DVM can read.
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