Greetings to all the members,
I need help to build a dual power supply for my pre-amplifier board which requires ±22VDc (Max) for good operation.
The transformer which i have is a toroidal 50VA with Secondary output of 18v-0-18v.
PCB board that i have with me has been designed as per the schematic i have attached with this post.
I Request kind Members to Please recommend the components i hould use to receive the Maximum output of ±22VDc & Best power filtering from this Circuit.
Any Kind advises will be deeply appreciated. Thank you.
Best Regards.....
I need help to build a dual power supply for my pre-amplifier board which requires ±22VDc (Max) for good operation.
The transformer which i have is a toroidal 50VA with Secondary output of 18v-0-18v.
PCB board that i have with me has been designed as per the schematic i have attached with this post.
I Request kind Members to Please recommend the components i hould use to receive the Maximum output of ±22VDc & Best power filtering from this Circuit.
Any Kind advises will be deeply appreciated. Thank you.
Best Regards.....
Attachments
Last edited:
I bot the Power supply PCB from ebay, but for some reason the output from that board is ±42VDc where as the input is 18-0-18AC, may be i need to change the components on the board.
You can obtain +-21v well regulated supply with up to 1,5 amps with this setup, with 18-0-18v ac with this setup🙂
even at the best and without regulation you can only get around 24,2v +- out of the setup you have shown
Well that is what i Expected when i built the PS today, expected the supply to be max ±24VDc, but i was shocked to see that the output is ±42VDc where as the input to the board is 18-0-18ac, i have never come across this type of problem.
Hi,
What it is the Ac input voltage for the transformer? Maybe your using a 120 volts AC input transformer in a 220 Ac.
What it is the Ac input voltage for the transformer? Maybe your using a 120 volts AC input transformer in a 220 Ac.
Measure the AC voltage going to the bridge. If the AC voltage more than 20 something than you are using 18v to 18v taps for a total of 36v. Wire up the transformer from one of the 18v taps to the 0v center tap. This will drop your voltage by half since you are only using one of the two winding available.
No, Here in My city it is hard to find a Transformer with primary 120volt, I am 100% sure that the Ac input for my trans is 220v because i needed it that way.
Last edited:
My Bad.... It seems i made a mistake while making the connections, Connection was as Shown below.
Trans AC1 (18v) -------->> PCB AC1 in
Trans 0volt -------->> PCB AC2 in
Trans AC2 (18v) -------->> PCB 0v in
Now i have disconnected the bad connections. Before I make the correct connections, does any one think that i might have some how damaged the transformer because of the bad connection???
My Bad.... It seems i made a mistake while making the connections, Connection was as Shown below.
Trans AC1 (18v) -------->> PCB AC1 in
Trans 0volt -------->> PCB AC2 in
Trans AC2 (18v) -------->> PCB 0v in
Now i have disconnected the bad connections. Before I make the correct connections, does any one think that i might have some how damaged the transformer because of the bad connection???
- Status
- Not open for further replies.