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Acca 8th August 2013 07:42 PM

DIY Good Class D amplifier
5 Attachment(s)
Simple amp. based on SG3525 PWM IC.
Frequency is fixed to 150kHz (fixed f is good choice) but you can modify it by changing RT/CT.
PWM is ~2-98% (which is very good).
IR2184 is HI/LO side gate driver.
Dead time provided by this IC.
Set the potentiometer on half.Turn amp ON.Set output voltage to 0V.
This amp works from first attempt ;)
On PCB i have to use external 12V PSU for IC's
Max input voltage is +-80V.
With 4k7 adjust gain.
Output inductor is gapped core (can be used yelow toroids from AT/ATX PSU,they have internal gap.
In external 12V version you can regulate the output power only by voltage on fets.
12V is referenced to -V,not to GND!
On picture I used totem pole output instead of FET's and driver IC,but I tested wih IC and FET's too.

airwavesystem 9th August 2013 02:20 PM

i do not think the proformence is good~

Workhorse 9th August 2013 02:47 PM

Better use TL494 in place of SG5325 with collectors joined 'ORed' and you will get better results. Try to use feedback also to make it immune to gain variation with power supply deviation.

J.R.Freeman 9th August 2013 04:41 PM

Neat, Acca! Did you manage to get your point-to-point prototype running?

chinokscapsighter 10th August 2013 04:07 AM

Nice interesting Project...

Acca 12th August 2013 10:26 AM

It's better than UcD

No,I tried it,and here's more noise than 3525.And max. PWM on 494 is smaller.
I want to have no feedback.Because of this power can be varied only by voltage on fets,without any change.You can use variable supply and vary volume by it.


Thank you.
Few man's from another forum make this amp. in progress.
When they make it,I'll post here.

Acca 12th August 2013 10:33 AM

This smps can be used to power this amp.:
Uni SMPS 3 - Smps - DiyAudioProject

mosfetventje 21st August 2013 12:44 PM

just a few questions from Holland......

Can I use the IR2117 to replace the IR2184?
Which transistor can i use for T3
Must R13 be 4K for 80V
Which Fets are T1 and T2 and can I put for example 2 X IRFP460 into your design and bring up the supply to 150V?

Thanks for looking at my questions.

stewin 21st August 2013 05:44 PM

hi acca this a very nice project . just wanted to know have you tried your amp at +/-80vlts with 1ohm load? which fets did you use .? and can it be bridged at 2ohms with that voltage?

also can i redraw your schema and use ir2110 or ir2153 as the gate drivers.?

thanking you in advance steve .

stewin 6th September 2013 06:49 PM

hi acca any developments of your amp?

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