Not sure fi this has been posted before sorry if it has.

http://www.storm-software.co.yu/diy/index.php?project=software

The boards from this site look very interesting and not difficult very difficult to implement.

http://www.profusionplc.com/pro/gex/prodGen.html?prdtyp=reverb#

Right i was reading a section over on DIYaudio when a guy called minion posted an active tone control section. I thought this combined with the 2 stage preamp i was working on would probably work quite well.

This was my first thoughts on the idea

My amp setup uses a 100 watt class T amp and the TL071 based preamp many people here have help me with.

The issue is this, at high gain setting, i.e. when i want to play loud, the amp ocassionally gets stuck it a sort of weird feedback loop with the Bass driver pumping in and out slowly with no input from the guitar. Is that called motor-boating? Even totally dampening the strings doesnt stop it, the only way to control is it to either turn of the amp or cut the volume right down for a moment.

I was wondering what causes this and what could be done to reduce/eliminate it.

Any feedback(no pun intented!) greatfully recieved.

Phil

Should the input caps of my power amp be chosen to cut bass at the low end, to prevent waffle and conserve amp power? My current input cap should be enough to go down to 3hz but it seem this might be overloading the 10" speaker at extreme volume levels and the digital amp is powering off becuase it has reached it power limits. What would be a sensible cut of frequency for a guitar amp, baring in mind backing track are also played through the unit.

ANy input greatfully recieved.

Two stage preamp with tone controls,variable input sensitivity and very low power draw.

http://www.redcircuits.com/Page69.htm

I have had a go at redesigning the circuit using the TI single supply handbook.
It avoids most of the pitfalls of the original though i am not expert.
If anyone in the know can comment that would be good.

I will try it with both a TL071 and a OPA134.
The OPA134 should sound better since it is a very high spec opamp btu you never know!

Hi,

This is my first post on here and hopefully i can ask for people help.
Just so as you knowI am not a musicain at all, however I am very into DIY audio and have build countless LM3886, LM 3875 chips amps and also a fair few Class-D Tripath based kits.

I am building a Amp for a friend who is a guitar based busker in London.
The main issue is this the busking pitches have no power so everyone needs to use battery powered amps.
The best of these are the Crate Taxi /Limo series.
All use some weird Class-H Philips chip which is very unreliable for day to day use.

I am mid way through building a amp setup but could use some advice.

For the power amp module to maximise battery life, and in my opion sounds quality i am using a kit from 41hz.com. Jan kits involve a lot of SMT bits so arent easy to build but sounds great and are reasonably priced. I also love the Tripath sound and think it would work very well with live music.

What i wanted to ask was advice on the preamp side of things. I have looked at loads and loads of sites and to me this is the hardest part particualrly when runnign of a single SLA battery.

What would be a good front end? My mate plays both electric and semi-acoustic guitar and would also needs a cd input for backing tracks from an iPod.

My idea was something like this an English Channel or Sans Amp GT-2 as a preamp, then an fx loop, and summing amp such as http://www.muzique.com/schem/mixer.gif to mix in the CD\ipod and finally a 41hz.com AMP 32.

Does this sound about right? Also has anyone got any experience with the English Channel or Sans Amp for use with an acoustic guitar?

I have no experience and would love some advice.