GB for small isolated power module.

[nguitar12]

Hello everyone I am looking for some small DC-DC power module for my vocal preamp and guitar pedal that needs bipolar supply. I found these module (see attachment)

General Specification:

- Dimension 11.9x7.5x10mm (single output) / 20 x 7x10mm (dual output)
- voltage not regulated
- 70-80% efficiency
- switch frequency 100-200khz
- Input / output isolated

They have varies model for different input and output. The seller won't sell it for cheap if I buy less than 20 pieces I personally will need 3-4 unit only so I am here to see if anyone will be interested in these as well. Here is the price.

USD5 for i module
internationally shipping USD5 (1-5pieces)

They allow me to mix up different model so if I have another 15 pieces order and the GB will go.

 

[richie00boy]

Have you considered just using a supply splitter? Using a pair of transistors or an op-amp. Cost less than 1USD and should be fine with a simple circuit like a guitar pedal.

 

[nguitar12]

Have you considered just using a supply splitter? Using a pair of transistors or an op-amp. Cost less than 1USD and should be fine with a simple circuit like a guitar pedal.

I tried using two resistor to make a virtual ground circuit as discussed in this thread:
http://www.diyaudio.com/forums/chip-amps/267465-unknown-78l15-regulator-problem-very-weird.html

Since I am making a pedal with small enclosure so I end up decided to use a small module as I don't have much room to work with.