• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Class D Bass amplifier

Status
Not open for further replies.

doomblack

New Member
Hey guys!

I recently finished my first larger project (in a long time!)
more: chung cư 17 phạm hùng
As Hero will probably remember, I was considering building a Class D Bass amplifier! Well I have done so and completed it now.

Spec:
240v Input, Dual laptop supply-age!
170w Output (Theoretical)
+/- 24v PSU
Based around the TDA8920BTH in BTL mode
4Ohm 12" speaker
Laney Bassman 40 Preamplifier

I had intended to convert my Laney Bassman 40 into a much better amplifier because to put it bluntly... It sounded like utter cr*p due to the lame-ass power stage!
more: biệt thự athena kim giang
Luckily with this amplifier, the power amplifier and preamplifier stage were two separate PCB's meaning I could hopefully savage it and use the preamp stage with a new power stage (I diagnosed the problem of which stage sounded so bad by testing the line-out section of the preamplifier on my Marshall Bass 20 amplifier (a lovely amplifier!) and the preamp stage sounded very sweet.

So! I ripped out the horrible power stage along with the bulky transformer (this reduced the weight a lot! And prepped the Preamplifier stage for use with my new power supply (the transformer was a 30v-30v non-torroidal one). After testing the preamplifier stage at +/- 24v, I concluded that it worked fine.
more: iris garden
I bought the power supply and power amplifier board off eBay for a total of:
 
Last edited:

unclejed613

Well-Known Member
Most Helpful Member
good bass amps are mostly power supply.... i used to have a Traynor 100W head when i was in high school, and i kept thinking it sounded awful when playing with a band. a few years later i got an Earth 100W head, and it weighed a lot more, because of the power transformer being about twice as big, even though the output transformer was about the same size. that Earth amp sounded much better than the Traynor, even through the same speakers.

if i were to build a bass amp today, i would probably not use a class D amp, but a good class AB design, but that's my druthers... the power supply would definitely be where i would give the most attention to detail
 
Last edited:
Status
Not open for further replies.

EE World Online Articles

Loading
Top