Solid State Guitar Amp Forum | DIY Guitar Amplifiers
Solid State Amplifiers => The Newcomer's Forum => Topic started by: NPreston on March 03, 2017, 08:39:48 AM
Hi, so I have finally joined SS guitar!!! Something I have been meaning to do for a while..
So I have been tinkering in the basement building a crude yet functional amp (which I think sounds pretty decent so far)..
I have a background in electronics but havn't worked in the field for a good 5 years now.. And even then I worked mostly in repair/calibration.. Design is something new to me and is quite challenging..
anyways, I look forward to learning more and being able to share what I think I know!
Here is a link to how things sound so far!! Enjoy!
https://www.youtube.com/watch?v=KbZLZe0DjwI&spfreload=5
1) welcome :)
2) killer sounding amp :)
3) now tell us more about it :)
Thanks!!
Im pretty happy with the results so far. but I got to give most of the credit to the speakers themselves..
I dont have schematic drawn up, just been kinda hacking away and learning as I go.. I'll do my best to explain..
In any case its pretty simple so far. built on +/-15v rails using tl072 op amps and clipping back to back mosfets that have their drains connected to the gates.. gives about a 2V threshold.. in addition there are 2 stages of clipping that have lowish resistance between the mosfets and ground for a little more softness to the clipping. all of this is inverted and buffered through another set of tl072s then fed to a common emitter config with 4 diodes in the collector side then off to a class AB configuration using TIP 142/147 and roofing hardware as heat sinks.. The last op amp buffer has a variable DC built in so I can minimize the final DC at the speakers..
Absolutely no filtering or eq yet tho.. and just a bench suppply.. Would like to build a real power supply soon as mine is pretty old and starts to drop out when I try to push any real power.. its probably 40+ years old and could probably use Caps ect..
I'm with JM, good sounding amp! If/when you draw up a schematic, I'd love to see it. What kind of wattage output do you expect with a 142/147 based amp on +/-15v rails?