Members etcetera Posted September 29, 2007 Members Share Posted September 29, 2007 I have a pre-amp which can only use a battery. I would like to change it to a power supply. Could it really as simple as connecting the 2 wires from a 9 volt power supply to the battery connector ends on the unit ? Of course I would observe polarity and enough miliamps power. Thanks for any input,Etcetera Link to comment Share on other sites More sharing options...
Members Prog Posted September 29, 2007 Members Share Posted September 29, 2007 Of course I would observe polarity and enough miliamps power. As long as you understand those aspects, 9V = 9V. It will work fine. Link to comment Share on other sites More sharing options...
Members etcetera Posted September 29, 2007 Author Members Share Posted September 29, 2007 Thanks Prog, I was getting one of those "too good to be true" things. I'll pick up a battery clip and just hook it to the pre amp battery clip in case the need arises to go back. Link to comment Share on other sites More sharing options...
Members el_tonto Posted September 30, 2007 Members Share Posted September 30, 2007 You might need to add more power supply filtering. Anything designed for battery-only might have skimped on filtering, because there is no AC component (ripple) on a battery supply. Link to comment Share on other sites More sharing options...
Members jafair Posted August 19, 2008 Members Share Posted August 19, 2008 i had the same question. this clarifies a little... but... how do i filter the power supply? i want to power my z vex super duper with a normal boss style power supply. i have seen kits on ebay but would like to do it myself. and do i need to be careful about the power supply having too many miliamps? Link to comment Share on other sites More sharing options...
Members Pillimees Posted August 19, 2008 Members Share Posted August 19, 2008 No, you only need to worry about having too few milliamps. Pedals will draw as much as they need, so just calculate the total current draw of the pedals you want to power with the adapter, add some 10-20% (so the adapter isn't constantly pushed to its limits) and have at it. As for filtering, google for schematics. Also search sites like tonepad.com and generalguitargadgets.com - they have schematics and PCB layouts for a number of power supplies. Link to comment Share on other sites More sharing options...
Moderators AMZ-FX Posted August 19, 2008 Moderators Share Posted August 19, 2008 i had the same question. this clarifies a little... but... how do i filter the power supply? i want to power my z vex super duper with a normal boss style power supply. i have seen kits on ebay but would like to do it myself. and do i need to be careful about the power supply having too many miliamps? A resistor-capacitor filter will take care of it. Here is my article about hum filtering: Hum and Noise Be sure to connect the battery into the switch circuit of the external jack - don't just parallel it with the power input. If you do, the external power will try to charge the battery and it will eventually leak. regards, Jack Link to comment Share on other sites More sharing options...
Members jonjohn Posted August 19, 2008 Members Share Posted August 19, 2008 A resistor-capacitor filter will take care of it. Here is my article about hum filtering:Hum and NoiseBe sure to connect the battery into the switch circuit of the external jack - don't just parallel it with the power input. If you do, the external power will try to charge the battery and it will eventually leak.regards, Jack That looks great Jack.I must say your site and posts here I have found more than helpful in my trying to learn about Diy electronics.You rock Link to comment Share on other sites More sharing options...
Members WRGKMC Posted August 19, 2008 Members Share Posted August 19, 2008 Circuits that have only battery have no filtering. i suggest you get a zero hum adaptor like a dan electro or a boss. The cheap radio shack or kmart ones will make it hum badly. Link to comment Share on other sites More sharing options...
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