Millipede PCB Capacitors

D_Harris

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I'm looking to replace the capacitors on a couple of my Millipede PCBs and was hoping to get confirmation on their value.

Can someone tell me if the following are correct for the axial capacitors marked with red and yellow boxes in the picture below?

100uf 35V capacitors
1uf 50V Capacitors
47uf 50V capacitor
10uf 50V Capacitors


Also, since I cannot find the exact same capacitors on Bob Roberts' site should I look elsewhere or are there plausible substitutes I can order?

Thanks.

Darren Harris
Staten Island, New York.
 

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I'm looking to replace the capacitors on a couple of my Millipede PCBs and was hoping to get confirmation on their value.

Can someone tell me if the following are correct for the axial capacitors marked with red and yellow boxes in the picture below?

100uf 35V capacitors
1uf 50V Capacitors
60 VDC 85° + C CF capacitor
10uf 50V Capacitors


Also, since I cannot find the exact same capacitors on Bob Roberts' site should I look elsewhere or are there plausible substitutes I can order?

Thanks.

Darren Harris
Staten Island, New York.

Digi-key or mouser are elecronics distributors and have most everthing.

Find the schematics and confirm the values - I believe there is a scan of these schematics out there.

Capacitors have two values: capacitance and voltage. You need to match the capacitance, but if you want you can use capacitors that have a higher voltage (the voltage is a 'max' rating).

You'll also want to know what TYPE of capacitor, which again the schematic can tell you.
 
Unless they are visually damaged or missing, there isn't a huge need to replace them.. As they aren't under as much stress as monitor caps..

Plus most of those caps can be found a radio shack.. Just buy higher voltage if not matching.
 
You'll also want to know what TYPE of capacitor, which again the schematic can tell you.

I don't understand what you mean by "type". Do you mean axial or radial?

Unless they are visually damaged or missing, there isn't a huge need to replace them.. As they aren't under as much stress as monitor caps..

Well I have a blown cap on one of my Millipede PCBs and I figured that being about 30 years old it might be a good idea to just take care of all of them. (There are only 17).


Thanks.

Darren Harris
Staten Island, New York.
 
Last edited:
I don't understand what you mean by "type". Do you mean axial or radial?



Well I have a blown cap on one of my Millipede PCBs and I figured that being about 30 years old it might be a good idea to just take care of all of them. (There are only 17).


Thanks.

Darren Harris
Staten Island, New York.

By type I mean mylar vs ceramic vs electrolytic. Radial vs axial is the package.

I'm not sure which cap it is on your board, but if it's a buypass cap (connected between +5 and GND and placed right near the power pins of an IC, then you might well be able to live without it (bypass caps are necessary for reliability, but there are also quite a lot of them on an average board and you are not likely to notice the loss of one or two). Also, mylar and ceramic caps don't tend to degrade much over time, so the need for replacement is less than with electrolytics.
 
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