30-12-2020, 03:46 PM
In general, you can use a higher voltage capacitor than was originally used, assuming it will physically fit. With electrolytics it's better not to use a very much higher voltage rating. A 25V, 35V or even 63V part will be fine but don't use a 200V part.
All electrolytics have very wide tolerances. +/-20% is common. -25%/+100% not unknown. So 12uF is OK. But....
It's common for faulty capacitors to read high with simple testers. It's due to leakage which the tester sees as increased capacitance.
A 10u cap will usually be fine in place of a 4u but in this position it would be worth doing a bit more research to see if the design has changed. Don't worry too much. 10u will work.
Don't forget that electrolytics have to be fitted the right way round. On older caps the +ve end is usually marked + or is red. On modern caps the -ve end is usually marked with a strip and a minus sign. I have no idea why they now mark the -ve end.
All electrolytics have very wide tolerances. +/-20% is common. -25%/+100% not unknown. So 12uF is OK. But....
It's common for faulty capacitors to read high with simple testers. It's due to leakage which the tester sees as increased capacitance.
A 10u cap will usually be fine in place of a 4u but in this position it would be worth doing a bit more research to see if the design has changed. Don't worry too much. 10u will work.
Don't forget that electrolytics have to be fitted the right way round. On older caps the +ve end is usually marked + or is red. On modern caps the -ve end is usually marked with a strip and a minus sign. I have no idea why they now mark the -ve end.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
