pierrer
Well-known member
Hi,
I built the filter board project presented here:
http://archive.siliconchip.com.au/cms/A_30278/article.html
I did almost everything as they advise: same component refs/values save for filter cutoff tuning resistors/condensers, but I replaced the 1N4004s by UF4007s. Here is the schematic of the PSU:
On powering up, the 100uF cap following the 7915 fries. I have checked its polarity and it is installed the right way round. It doesn't happen to the capacitor placed after the 7815. The recommended 0.5A fuse also blows. I tried to measure the output voltage of the 7915 beforehand and it seems to be fine.
Any ideas what might be going wrong here?
I built the filter board project presented here:
http://archive.siliconchip.com.au/cms/A_30278/article.html
I did almost everything as they advise: same component refs/values save for filter cutoff tuning resistors/condensers, but I replaced the 1N4004s by UF4007s. Here is the schematic of the PSU:
On powering up, the 100uF cap following the 7915 fries. I have checked its polarity and it is installed the right way round. It doesn't happen to the capacitor placed after the 7815. The recommended 0.5A fuse also blows. I tried to measure the output voltage of the 7915 beforehand and it seems to be fine.
Any ideas what might be going wrong here?