Hi Kris,
Okay here is my attempt at the circuit board. The relay isn't on there as yet. I need to shuffle the RHS devices over a little more to create some room.
Not powered up as yet.
A few comments/questions.
I had a slight change in my originally intended layout due to space constraints! I was intending the HV to be on the top of the board and the LV at the bottom; I didn’t realise C1 was so big!!! Therefore in my hastily revised layout, I made a bit of a boo boo, therefore had to add the small jumper next to D3 (cut C2 legs too short).
I have connected both wiper and pin 1 of the trim pot together, assume this is okay?
I have broken the copper track between the terminals of C1 and between D1/D2 and D3/D4.
I have tested all tracks for continuity/non continuity where necessary. All seem okay as far as I can tell; however, testing for continuity on the track which is across the middle of the diode bridge (either side of the break), the DVM does show a reading, which I was initially surprised at but after thinking about it, it was rising/falling, therefore I assume it’s the capacitor causing this??
On a separate issue, If there was a fault in the board operation, then there would nothing to indicate this. I have some LED’s (spec below), which I think may be worth adding one to show the circuit is okay. Would it be possible to connect at the relay to show when the circuit is operational? I know this would not show the status of the relay, only the rest of the circuit up to this point?
My intention is to mount the board in an enclosure (with mains voltage warning labels), so the LED would be connected by flying leads from the board. I'll drill a small hole to fix the LED into the enclosure lid.
Power Dissipation: 84mW
Forward Current: 25mA
Reverse Voltage: 6V
Forward Voltage: Typ, 2.4V, Max,3V
Thanks as ever.