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Search: Posts Made By: Crystaleyes
Forum: General Capacitor Questions & Issues 08-13-2022, 03:26 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Re: Indentifying an old exploded cap.

So... turns out that 130Ω is not available in any of the shops here.

There are 50Ω or 1kΩ

What would happen if there were an 82Ω resistor placed in series with a 50Ω thermistor?

Or would...
Forum: General Capacitor Questions & Issues 08-10-2022, 08:30 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Re: Indentifying an old exploded cap.

Yeah. I can see that now.

Well done fella for cracking this one. And it's been another valuable lesson for me.

Thanks to all who chipped in.
Forum: General Capacitor Questions & Issues 08-10-2022, 05:49 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Re: Indentifying an old exploded cap.

Looks like you are correct as the resistance goes down with heat applied.

I never knew that thermistors were also colour coded, so that is another lesson learnt.
In fact I have found a picture...
Forum: General Capacitor Questions & Issues 08-10-2022, 04:49 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Re: Indentifying an old exploded cap.

It is across that 68Ω resisitor, and it measures around 170 ohms

The picture below is part of the casing which had blown off, with the silver band being above the orange
Forum: General Capacitor Questions & Issues 08-10-2022, 02:26 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Re: Indentifying an old exploded cap.

Gentlemen, please be so kind as to give a lady time to respond...

The trace side of the board has some kind of putty or resin, which can be seen in the photos and the blown cap came from the two...
Forum: General Capacitor Questions & Issues 08-09-2022, 06:29 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Re: Indentifying an old exploded cap.

The first pic is the board. It is fed from the optional battery supply and consists of 4 transistors, 5 electrolytics, a transformer, 3 ceramic caps and about a dozen resistors.

The second photo...
Forum: General Capacitor Questions & Issues 08-09-2022, 03:55 PM
Replies: 15
Views: 297
Posted By Crystaleyes
Indentifying an old exploded cap.

Hi all.

A friend asked me to help remove the mains hum from an old 60's or 70's portable record player.
The brand is Motoplay, which is an obscure Brazilain brand.

Anyway. One of the caps...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 08-04-2022, 07:29 PM
Replies: 4
Views: 103
Posted By Crystaleyes
Re: iMac logic board fan control question.

Have found a 220 Ω ferrite bead on another old iMac pcb but it's 0805 package is way too large, so shall do the wire trick mentioned earlier.


Wish me luck!
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 08-04-2022, 03:05 PM
Replies: 4
Views: 103
Posted By Crystaleyes
Re: iMac logic board fan control question.

I know that it's supposed to be ferrite but not sure where I can get one. Looking online here in Brazil I can find 150Ω or 330Ω

Is it so important that it is ferrite?
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 08-04-2022, 01:05 PM
Replies: 4
Views: 103
Posted By Crystaleyes
Re: iMac logic board fan control question.

Thinking to just solder a fine wire with a 220R resisitor in the middle, insulated and stuck to the board...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 08-04-2022, 10:28 AM
Replies: 4
Views: 103
Posted By Crystaleyes
iMac logic board fan control question.

I have a 2010 A1311 iMac motherboard which was possibly damaged by lightning.

One of the areas damaged was for the CPU fan control where inductor L5720 had exploded.
Looking at the schematic...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-03-2022, 05:31 AM
Replies: 4
Views: 224
Posted By Crystaleyes
Re: iMac A1311 PSU repair questions

As a final word, I threw in the towel, bought a used PSU for a tenner, and now the iMac lives again!
Forum: General Capacitor Questions & Issues 08-03-2022, 05:30 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

To be honest, I am not 'sure' that the missing board is a decoder.

I had said that, as the schematic download came with three pages and one of them has a separate circuit that is labelled...
Forum: General Capacitor Questions & Issues 07-31-2022, 09:24 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Thank you for the explanation.

In the end, I just left them as per the schematic and all is working fine,
Forum: General Capacitor Questions & Issues 07-31-2022, 09:05 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Nicely explained. Cheers




Well actually, the radio section is still dead. I haven't really examined it, but the voltage isn't getting to the FM board for sure.
The turntable and tape...
Forum: General Capacitor Questions & Issues 07-31-2022, 08:52 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

And if you look just under those resistors you will see two arrows pointing to a circle and a star. These are to indicate that they are supplying power to where those symbols reappear in the other...
Forum: General Capacitor Questions & Issues 07-28-2022, 06:10 PM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

All of the electrolytics were replaced after several had burst and others had a ridiculously high ESR or voltage loss.

Two other ceramic caps had blown (literally).


One question I do have...
Forum: General Capacitor Questions & Issues 07-28-2022, 05:05 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Is there a threshold with that higher F? Like 10% or 20% for example?

And could using 2200F instead of 1000F on the output caps cause any problems? Specifically, would it affect the output...
Forum: General Capacitor Questions & Issues 07-27-2022, 07:24 PM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Thanks for all this advice. Most appreciated!


Astonishingly, I found an AC128 in my components vault, down in the dungeon.

Btw, these are the square ones with a hole through (photo), which...
Forum: General Capacitor Questions & Issues 07-27-2022, 05:28 PM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

So...

Using the same AC128 germanium on the bad channel resolved the problem...!

It is not 'quite' as clear as the other channel, but I think once connected up, that only an audiophile...
Forum: General Capacitor Questions & Issues 07-27-2022, 03:51 PM
Replies: 36
Views: 913
Posted By Crystaleyes
Forum: General Capacitor Questions & Issues 07-27-2022, 03:50 PM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Very good point. I fact, it had dawned on me that I could compare the two channels' voltages, and had just finished drawing up a complete list of all the voltages from the schematic, which I can...
Forum: General Capacitor Questions & Issues 07-27-2022, 08:54 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Tbh I have never even heard of a 'blocking cap' but it is now catalogued in my subconcious archives.. So cheers.

This 'thing' is an old (1960's) Philips receiver/amplifier which is all solid...
Forum: General Capacitor Questions & Issues 07-27-2022, 08:44 AM
Replies: 36
Views: 913
Posted By Crystaleyes
Forum: General Capacitor Questions & Issues 07-25-2022, 07:58 PM
Replies: 36
Views: 913
Posted By Crystaleyes
Re: What are the 'actual' effects of old electrolytics in a vintage radio?

Thanks for the info, but here's another question...

There is the mains hum and all the caps have been changed. The two large outputs were originally 1000F 25v and were replaced with 2200F...
Showing results 1 to 25 of 174

 
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