I am looking to make an isolated power supply to replace my current 'daisy chain' setup.http://www.generalguitargadgets.com/projects/24-power-supplies/23-four-output-isolated
looks good but i have a few questions:
Locally sourced (240ish v ac) transformers are relatively expensive- around 22 bux for a dual 9v tap or 7-8 bux for single tap 9v.
i want to make an 8 outlet supply and so the cost blows out very quickly into the realms of -'just go buy one' territory. idea #1
: As a cost saving attempt my first idea i have considered is using a 2 amp transformer (out of the wall wart that i already have) and running multiple instances of the ggg circuit , from the bridge rectifier onwards, all off the one transformer tap.... I dont know if this will work as a means of isolation to prevent ground loops or not? will it work?
While i am pondering this i start cursing the prices of transformers at my local retail electronics store (because deep down i suspect that my single transformer solution wont do what i want it to) i think- " if that tranformer is worth 7 bucks then how can a hong kong company on ebay put one in a wall-wart and sell it to me with cable , case, components and everything posted to my door for 4?"..... it took about 10 minutes for this to sink in...... but when it did i realised how i could save a few dollars on my transformers.
Now i am stuck wondering what the difference is between building this circuit with the 8 transformers out of the wall warts off ebay and just getting a power board and having 8 wall warts running? (size i guess is the obvious one.)
If my first idea would work, that would be ideal for me because i could start it straight away, failing that i guess i have a 2 to 6 week wait on postage from hong kong.