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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Non-polarised electrolytic capacitors needed!
HI All
I need a quantity of non-polarised Electrolytic caps, radial-ended, in order to re-cap an old Lowrey electronic organ. According to the parts list the original components are 3uF / 20V - but something near to this (maybe 4.7u) would do - likewise the voltage rating - but component size is fairly important as the replacements need to fit in place of the originals (5mm diameter / 11mm long). There's one of these components for every key on the upper manual - they control key sustain - so about 40 would do nicely. I can find a 3.3uf / 100V at 34p per 5 (www.cpc.co.uk) - wonder if anybody knows of any alternative UK suppliers, tried Maplin & RS without success..... any other suggestions please ? TIA Adrian Suffolk UK |
#2
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"Adrian Brentnall" wrote in message ... HI All I need a quantity of non-polarised Electrolytic caps, radial-ended, in order to re-cap an old Lowrey electronic organ. According to the parts list the original components are 3uF / 20V - but something near to this (maybe 4.7u) would do - likewise the voltage rating - but component size is fairly important as the replacements need to fit in place of the originals (5mm diameter / 11mm long). There's one of these components for every key on the upper manual - they control key sustain - so about 40 would do nicely. I can find a 3.3uf / 100V at 34p per 5 (www.cpc.co.uk) - wonder if anybody knows of any alternative UK suppliers, tried Maplin & RS without success..... any other suggestions please ? TIA Adrian Suffolk UK Rapid Electronics do a range of non-polarised here http://www.rapidelectronics.co.uk/rk...2536&XPAGENO=1 (from http://www.rapidelectronics.co.uk/) - they do a 4u7 35v in a case size of 11 x 5mm for £0.048, or cheaper in quantity. They also do a 3u3 100V in a case that's 11 x 6mm for 7p each (or 6.4p if you want 40) - but I'm not sure how well a 100V rated non-polarised would behave with less than 20V on it. |
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Since no doubt you're doing this for sound quality reasons, might I suggest you
consider better caps, like the poly dipped kind, or maybe those designed for high end speaker crossovers. Not only should they last longer, but they'll likely have lower ESR and the capacitance will be more accurate. If this thing is older, lytics weren't quite as small back then and you might just be able to fit them in the space you have. Another reason for doing this is that electrolytics caps of the newer type seem to be a pariah to the equipment in which they're installed. Having designed and built a few amps, I avoid using electrolytics in the audio path like the plague. Only if and when nessecary. Of course I'm going to use them for power supply filters, but in the audio path I think they're bad news. Even if you wind up using 'lytics, try to find some good ones, i.e. not the kind they use in TVs. Possibly you could talk to someone at a local high-end audio repair facility. They would know more about where to get such parts in your area. JURB |
#4
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HI Harvey
Rapid Electronics do a range of non-polarised here http://www.rapidelectronics.co.uk/rk...2536&XPAGENO=1 (from http://www.rapidelectronics.co.uk/) - they do a 4u7 35v in a case size of 11 x 5mm for £0.048, or cheaper in quantity. They also do a 3u3 100V in a case that's 11 x 6mm for 7p each (or 6.4p if you want 40) - but I'm not sure how well a 100V rated non-polarised would behave with less than 20V on it. Many thanks - looks like Rapid are the ones - reasonably priced as well - wonderful ! I'm not sure what the likely effect are of running an electrolytic at 1/5 of rated voltage.......... so probably best to go for the 35V ones. These caps are in a pretty undemanding circuit - they provide a sustain effect by charging & discharging through a couple of diodes - so as long as they're all the same (nominal!) value - then the exact value isn't critical...... I've had three or four of them fail so far - so it seems like a good time to change the lot of them - perhaps the organ will run for another 30 years after that ! Many thanks Adrian Suffolk UK |
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