Use one 100uF/16V and one zener diode (5.6-6.2 Volt/1W) at 5 Volt rail (output)
You only show a regulator for the positive side. If you don't need a negative output, then eliminate the 47uF capacitor, and don't use the lower 2 diodes of the bridge
The connection from the mains to the secondary should be removed. The spikes are probably coming from capacitive coupling between the mains neutral and the PSU ground
One way to reduce EMI from this type supply is to connect a series RC network across the transformer. You need to experiment, but a good staring point is 2.2k, .001uF
i haven't seen it in all the power supply circuits i looked at ( is there a special purpose for this connection?)
see circuit belowi can only imagine this..could u upload the diagram please..?
Use trancient voltage suppressor
If you still have problems try using chokes at the input or even ferrite clamps at the mains cables
The ferrite clamps work like ferrite beads on cables
Since ferrite clamps seem to work try passing your mains cables (both of them) a few times through a ferrite torroid to form a common mode choke at the input of the circuit or connect a common mode choke before the mains transformer
What was the ill effect of the common mode chokes?
Try different types of ferrites, the 20MHz cores look promising
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?