Jump to content

Battery to power supply question.


etcetera

Recommended Posts

  • Members

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

  • 10 months later...
  • Members

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

  • Members

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

  • Moderators

 

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

  • Members

 

A resistor-capacitor filter will take care of it. Here is my article about hum filtering:




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

 

 

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

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...