randrdesulfatorforum : Message: Courtiestown PIC pulser

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Courtiestown PIC pulser

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Message #232 of 1261 |

Hi,

I have one of the Courtiestown PIC pulsers that has worked flawlessly
for a couple of years.

.... until now that is!

I'm having problems with the FET drive section of the board, with Q2
and Q3 (NPN 2N3904) blowing, causing the FET to remain in continuous
conduction and blowing the fuse.

Any suggestions from here on what might be going on? (seems to be
related to amplitude)

Rod

Thu Jan 3, 2008 10:13 pm

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"rod.badcock" <rod.badcock@...>

rod.badcock

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Message #232 of 1261 |

Expand Messages	Author	Sort by Date
Hi, I have one of the Courtiestown PIC pulsers that has worked flawlessly for a couple of years. .... until now that is! I'm having problems with the FET drive...	rod.badcock	Jan 3, 2008 10:13 pm
Hi Rod. Related to amplitiude? The amplitude of what? Rick. ... From: rod.badcock <rod.badcock@...> To: randrdesulfatorforum@yahoogroups.com Sent:...	Rick fun_4_me_now...	Jan 6, 2008 11:32 am
Rod, Yours was an early example and I cvan't honestly be sure of the specification of the 2N3904/ 3906 devices originally fitted. I do now use the 60V rated...	linesrg48	Jan 8, 2008 11:43 pm
Sorry I haven't posted back on this forum sooner! To answer some questions: the 'amplitude' I was referring to was the pulser trimpot - as the coil audible...	rod.badcock	Jan 9, 2008 3:24 am
Hi Rod. ... The trim pot is supposed to be set at build time and left alone. When you turn it you can operate the pulser WAY outside of it's specs. It is a...	Rick fun_4_me_now...	Jan 9, 2008 9:50 am
Rick, I have been hammering the poor little transistor used in the FET driving circuit (base connected to the PIC), and yes this is the one that blew. I must...	rod.badcock	Jan 9, 2008 5:48 pm
Hi Rod. ... I was thinking the same thing. ... If you reset the pot and leave it alone it should not need an upgraded transistor. ... Let me say this. ...	Rick fun_4_me_now...	Jan 9, 2008 7:14 pm

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