Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-23 Thread Mattis Lind
2016-03-22 20:47 GMT+01:00 Noel Chiappa : > > From: Josh Dersch > > > I have no excuse, I just get nervous working on these things. > > I should hope you do get nervous! Anytime one is working around equipment > that > contains lethal voltages, one _should_ be

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-22 Thread Noel Chiappa
> From: Josh Dersch > I have no excuse, I just get nervous working on these things. I should hope you do get nervous! Anytime one is working around equipment that contains lethal voltages, one _should_ be nervous! It helps with... > I suppose eventually I'll get used to it. Don't

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-22 Thread Josh Dersch
On Tue, Mar 22, 2016 at 12:29 AM, Mattis Lind wrote: > >>> Good news - mine worked so fingers crossed for yours too. I now have a > >> functioning PSU again though I've not tried it back in the chassis > yet... > >> > >> Nice! My replacements arrived today and

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-22 Thread Vincent Slyngstad
From: drlegendre: Monday, March 21, 2016 6:50 PM I don't quite get what makes this DigiKey part suitable for the role of a fused resistor. I do see that it has specs for 'fusing behavior' but that aside, I don't see that this series is marketed / sold as a "fusible resistor". I take "UL1412

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-22 Thread Mattis Lind
>>> Good news - mine worked so fingers crossed for yours too. I now have a >> functioning PSU again though I've not tried it back in the chassis yet... >> >> Nice! My replacements arrived today and unfortunately I did not have > such good luck. No smoke or fire, but now I get nothing at all out

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-21 Thread Chuck Guzis
On 03/21/2016 07:34 PM, dwight wrote: Maybe a real fuse in series with a real resistor. I'd asked that, but reconsidered in that fusible resistors all seem to have a strong positive temperature coefficient and then a point at which they will fuse. IOW, the things degrade gradually before

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-21 Thread dwight
Subject: Re: Resistor/Fuse replacement (DEC H7104-D) I don't quite get what makes this DigiKey part suitable for the role of a fused resistor. I do see that it has specs for 'fusing behavior' but that aside, I don't see that this series is marketed / sold as a "fusible resistor".

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-21 Thread drlegendre .
I don't quite get what makes this DigiKey part suitable for the role of a fused resistor. I do see that it has specs for 'fusing behavior' but that aside, I don't see that this series is marketed / sold as a "fusible resistor". One reason I question it, is the fact that the fusing ratings are

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-21 Thread Adrian Graham
On 18/03/2016 02:11, "Josh Dersch" wrote: >> Onecall are education-only suppliers but the same part numbers work with >> Farnell/Element14. Part# is 1692450. >> > > Thanks! Yes, that looks very similar except mine has a tolerance rating > of 10%. Vincent helpfully pointed

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-19 Thread Adrian Graham
On 18/03/2016 02:11, "Josh Dersch" wrote: >> However the only ones they sell are 5% tolerance, ie brown-black-gold-gold >> not brown-black-gold-silver + blue, but the technical chap I spoke to seemed >> certain these would be ok. I bought 5 just in case. >> >> Onecall are

Resistor/Fuse replacement (DEC H7104-D)

2016-03-19 Thread Josh Dersch
Hi all -- Yesterday I replaced the dead 2N6547 transistor in the H7104 and fired 'er up again. Same exact results. (The timbre of the power supply whine may have changed slightly, it's hard to tell). So, back to the drawing board. I tested the replacement transistor after power-up and it

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-19 Thread drlegendre .
Glad this came back up. Was any consensus achieved, regarding the use of `flameproof` resistor types as direct substitutes for designated "fusible resistors"? On Thu, Mar 17, 2016 at 7:44 PM, Adrian Graham wrote: > On 17/03/2016 22:46, "Vincent Slyngstad"

Re: Resistor/Fuse replacement (DEC H7104-D)

2016-03-18 Thread Vincent Slyngstad
From: Josh Dersch: Thursday, March 17, 2016 3:34 PM It's listed in the print set as a 1 Ohm, 2 Watt resistor, with a "FUSE" designation. I'm not entirely sure what I should be searching for for a replacement; clearly the "fuse" part of the designation is important but I'm not sure what a