Here it is coming at you "Lo Fi" Style


2008-03-21 10:13 pm
Hello all,

Firstly, I am in no way calling chip amps Lo Fi. (see end of post) - Coming at you Lo fi style is a sample from a Dance track from a few years ago where it was on about VCRs. Plus I thought the title would get a little bit of interest.

I've been reading this forum for a few years now. Got loads of good knowledge from them.

In keeping with typical DIY style I have a totally over engineered 3 Way Active setup. With Leach amps for mids and highs and 2 500W Plate amps for the Bass.

Anyway, I'm going for a break from increasingly going higher and higher end. My plan is to build a BPA400 to compare against my current Plate amps. The goal is to make this using cheap components throughout.

Currently, I am concerned with oscillations, having read threads where people have had these things exploding. I am building the inverting version and plan to set the offsets before attaching output resistors. What is the best way to suppress these oscillations?

Initially, this prototype will be powered from a couple of Xantrex XHR psus. The have variable voltage ouput of 0 to 150V. The current can be limited in 100mA steps up to 7.5A. What would be the minimum setting that would allow this prototype to power up?

Also, I'm looking at using LM317 regulators with pass transistors to regulate the supply. Is this a sane option? Is there a cheaper option that would work?

My plan with this project is to see if I can tell the difference between high end DIY and cost focussed DIY

Any comments would be greatly appreciated.

Many Thanks