IRS2092 Class D build. BURNED :D

[Tibouchina]

ChocoHolic 2092 Design

I'll check out those kits and probably do one. I want to use it for a power amplifier for a tube based preamp in a guitar amp... in theory.

~Phil

You might like to search this forum for threads started by ChocoHolic. His 2092 amplifier design appears to satisfy many of your requirements. And, ... he did a quite a bit of initial prototyping without a PCB. He has released schematics, BOM and PCB files. JLesterP create his own version of the Chocoholic Amp and is currently selling assembled amps/PCBs on ebay (see https://www.ebay.com/sch/jlelectronicsph/m.html?_nkw=&_armrs=1&_ipg=&_from=


See: SystemD LiteAmp.


#490 and 491 for PCB design files, Gerbers and BOM

#370 for schematic
#289 for simulation
#742 for JLESTERP version


Regrds ...

 

[sweetperfume]

I've actually got a hot air station too. I've made some pcb's that are 16 pin mount with through hole for them. I just realized via this mess they'll be useless for this purpose, now to find another good use for them 😀

I'll check out those kits and probably do one. I want to use it for a power amplifier for a tube based preamp in a guitar amp... in theory.

So single channel, up to maybe 200W max is fine. Probably even better if it's way lower like 50W and can be played at bedroom levels or sent off to an audio interface from the preamp for recording etc.

Thanks,

~Phil

If 50watts is all you need then go for tpa3116.

 

[Mooly]

I'll check out those kits and probably do one. I want to use it for a power amplifier for a tube based preamp in a guitar amp... in theory.

Always remember that (depending on the design) valve circuitry might have more than a few volts present at the output terminals from such things as coupling caps with no bleed resistor on the output to ground.

If you attempt to connect these to solid state circuitry with such a voltage present then it likely spells doom for the chip you are connecting to.

Just follow good practice with regard to signal coupling to ensure you never have any unwanted voltage present on floating outputs and so on.

 

[russc]

Must be too difficult. Connexelectronics DID a class D kit. Now the 'kit' is only supplied fully assembled.
TA3020 Audio Amplifier V3k | Connex Electronic
'Description - TA3020 based KIT amplifier fully assembled and tested.'
Which seems a bit pointless.

Unless you especially want the experience of build your own, there are loads of ready built boards available.

 

[NMOS]

Here's the board, no PCB, just FR4 with eyelets, I usually do Tube amps so this is what I had at hand to easily prototype it.

Not sure how it will be oriented, but the mosfets burned when i did some testing post smoke out. The mosfets empty holes are on the output side, the input is the opposite, I used a pcb to through hole mini board so I could mount the IRS2092 easily in this format.

Please listen to Mooly

you need time to learn it,... look for private Facebook Group Chipamp Class D

For learn and understand basics how to design PCB its also better you buy assembled IRS2092 Chipamp from Alieexpress before you starting own project to avoid smoke and fire

Your PCB design looks like a Class AB amplifier, it cant work with Class D
reading IRF documents designing Class D amplifier and PCB

long time ago I understand nothings about Class D and reading a lot of literature today I can design Kilowatt Class D PA amplifier PCB

 

[NMOS]

As i told you in first replies, you cannot do such amplifiers by just connecting wires. Class d generally works above 200khz. You not only required a good layout pcb but also an oscilloscope. Everyone is a noob untill he tries and fails.
Specially for Irs2092 you should follow the application notes. And if you want to fast forward everything then just build a pcb using iraudamp7 gerber files. If you do everything as mentioned in there then it will work right from the first time.
Hope it helps you

also output filter design is important to get stable working class D

I have make also 330khz Class D PCB amp working fine 75 VAC output Power with +/- 140 DC Rail Halfbridge

No smoke

 

[pompeiisneaks]

I can't remember seeing the LJM kits in mono, only stereo (two boards). And for 50W or less, if you're not heart-set on the IRS2092 and/or class-D, you could also maybe look at some of the chip-amp kits on ebay or Ali.

Also, the IRS2092 reference design has a pretty low input impedance, around 3.3K if i recall correctly. Not sure if this is an issue - if so an op-amp buffer between preamp and main amp might be needed.

If you have a cathode follower output to a tube it can be as low as 400 ohms impedance. I could even use a mosfet follower as tube amps do fine with specific types of high voltage mosfets as if they were a triode. Shouldn't be a problem impedance matching I think.

 

[pompeiisneaks]

Always remember that (depending on the design) valve circuitry might have more than a few volts present at the output terminals from such things as coupling caps with no bleed resistor on the output to ground.

If you attempt to connect these to solid state circuitry with such a voltage present then it likely spells doom for the chip you are connecting to.

Just follow good practice with regard to signal coupling to ensure you never have any unwanted voltage present on floating outputs and so on.

Oh? I've only ever seen mV post coupling caps as that's what they're supposed to do. In any builds I've done it's considered a failure if you have any voltage after coupling caps. Older amps sometimes have caps starting to leak voltage, yes... Or is this something else you're referring to?

 

[Mooly]

Just making sure any outputs are terminated correctly really.

An initially discharged coupling cap without a high value resistor load on the output to define a zero volt condition could easily allow a high voltage high current spike to pass from cap to the following stage if RCA leads were plugged in while the cap was in that non charged state.