Hi guys hope everyone is doing good
I have a question regarding an AC-AC, 15 VAC, 670mA power supply. I have put together the MFOS experimenter board synth and everything is working ok. The synth requires a dual supply range of +12/-12 Volt but can also be run at 9V+-. As Ray suggested on the website for people not used to working with mains power they should use 2 * 9v batteries connected in series with a center tap for ground, so that is what I have been using so far, however I would like to make the synth run off a mains powered supply. So, I have purchased an AC-AC, 15VAC power supply from rapid, https://www.rapidonline.com/ideal-power-77db-10-15m-15vac-670ma-plug-in-ac-ac-linear-psu-18-1499 , I have also purchased a L7915/L7815 regulated circuit board from ebay that has already been assembled to convert the AC signal into a dual +- supply rail. The question I would like some help with is:
The AC-AC power supply only has a positive and negative pin, where does ground go? The reason I ask is the L7915/L7815 board has 3 input pins which are labelled as AC, GND and AC. Am I right in thinking that the positive and negative connections of the supply would go to both the AC inputs, but, like I say, where is the ground connection then?
The other question I would also like to ask is; could I put a voltage divider (2 resistors in series), at the end of the regulated board to make it +- 12v instead of +- 15v?
P.S I am aware that the MFOS website has a section to build a wall wart power supply for the synth but I thought I could save some time and just buy the regulated supply part already assembled.
Any help would be greatly appreciated.
Thanks
I have a question regarding an AC-AC, 15 VAC, 670mA power supply. I have put together the MFOS experimenter board synth and everything is working ok. The synth requires a dual supply range of +12/-12 Volt but can also be run at 9V+-. As Ray suggested on the website for people not used to working with mains power they should use 2 * 9v batteries connected in series with a center tap for ground, so that is what I have been using so far, however I would like to make the synth run off a mains powered supply. So, I have purchased an AC-AC, 15VAC power supply from rapid, https://www.rapidonline.com/ideal-power-77db-10-15m-15vac-670ma-plug-in-ac-ac-linear-psu-18-1499 , I have also purchased a L7915/L7815 regulated circuit board from ebay that has already been assembled to convert the AC signal into a dual +- supply rail. The question I would like some help with is:
The AC-AC power supply only has a positive and negative pin, where does ground go? The reason I ask is the L7915/L7815 board has 3 input pins which are labelled as AC, GND and AC. Am I right in thinking that the positive and negative connections of the supply would go to both the AC inputs, but, like I say, where is the ground connection then?
The other question I would also like to ask is; could I put a voltage divider (2 resistors in series), at the end of the regulated board to make it +- 12v instead of +- 15v?
P.S I am aware that the MFOS website has a section to build a wall wart power supply for the synth but I thought I could save some time and just buy the regulated supply part already assembled.
Any help would be greatly appreciated.
Thanks