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DIY 4 Phase Sinewave Generator for Turntable Motor Drive
DIY 4 Phase Sinewave Generator for Turntable Motor Drive
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Old 8th February 2018, 06:36 PM   #491
jcastellano is offline jcastellano  Spain
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DIY 4 Phase Sinewave Generator for Turntable Motor Drive
Default This is what I’ve bought, hope it’s correct

Quote:
Originally Posted by Pyramid View Post
If you still want to generate 24VAC direct to the motor without transformers, you can look at an amp based on the TPA-3255 IC. It can handle up to 50VDC. Most of the ready built amps are BTL type, so it will be able to produce 24VAC undistorted. You will need a 36 or 48VDC supply to power the amp.

You could also use step up transformers (12V-115VAC) with your current design with step down transformers (115-24VAC) to the motor. I doubt that you could find 12V-24VAC transformers.
Hi Bill and all forum members,

This is the amp I bought:

TPA3255 Digital Power Amplifier Class D Audio Amp Assembled Board 300W&300W HiFi | eBay

And this is the PSU:

AC-DC Inverter 100-265V to 36V 5A Switching Power Supply Adapter SMPS Module | eBay

Hope its correct to power directly without transformers a 24v motor.

Regards,

Jorge
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Old 8th February 2018, 08:32 PM   #492
Pyramid is offline Pyramid  United States
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Quote:
Originally Posted by Cyber5 View Post
Hi Pyramid

Just to let you know what happened when I tried a 60va transformer.

I have tried a 60va Torroidal transformer with 2 x 18v windings just to see the result, because I had it to hand.

With TDA amp output set at 920mV input 12v output:-
The amp did not go into overload shutdown, worked correctly.

So I decided to increase the amp input (from 920mV to 1.7V) to give approx 18v output to supply the new transformer.
Result - The amp did not go into overload shutdown, worked correctly.

So I connected the deck, Result - The amp did not go into overload shutdown, worked correctly.

I cannot find the spec for the TDA amp.
Do you think the amp will be ok with the higher input voltage, It does not get any hotter than at the lower input voltage.

Has anyone used this amp with a 60w transformer?
See my posts to jcastellano prior to yours.

The TDA7492 is rated for 24VDC supply max. It can only produce ~17VAC without distortion. An 60VA 18VAC xfmr will output 21-22VAC no load and will require 21-22VAC to produce 115VAC at the primary (no load). If you are getting 18VAC at the output of the amp, it is probably clipped and resembles a squarewave. Even with 18VAC input to the toroid, you will not get 115VAC at the primary.

My suggestion: Use a 25VA 12VAC toroid. If you choose not to, you are on you own.

Last edited by Pyramid; 8th February 2018 at 08:36 PM.
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Old 8th February 2018, 08:34 PM   #493
Pyramid is offline Pyramid  United States
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Quote:
Originally Posted by jcastellano View Post
Hi Bill and all forum members,

This is the amp I bought:

TPA3255 Digital Power Amplifier Class D Audio Amp Assembled Board 300W&300W HiFi | eBay

And this is the PSU:

AC-DC Inverter 100-265V to 36V 5A Switching Power Supply Adapter SMPS Module | eBay

Hope its correct to power directly without transformers a 24v motor.

Regards,

Jorge
Those should work. Let us know how you make out.
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Old 9th February 2018, 12:13 PM   #494
Cyber5 is offline Cyber5
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Hi Pyramid

I will be ordering the 25va toroid as you suggested.
I just wanted to do some testing with the transformers I have in stock.

Thanks for the advise.
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Old 9th February 2018, 04:46 PM   #495
alexkosha is offline alexkosha  United States
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DIY 4 Phase Sinewave Generator for Turntable Motor Drive
Hi Bill, need your experience based advice. Got uP all is works perfectly fine. Installed encoder and power consumption jumped from 65 to 175mA. Rotation functions (as up and down) are not works. Took out flipflop and current dropped back to 65mA. I assume that my chip is DOA or I damaged it during soldering (my chip is CD74HCT74E). Have you saw such behavior? Does it make sense to use CD4013 and not CD75HCT type?
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Old 9th February 2018, 05:17 PM   #496
Pyramid is offline Pyramid  United States
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A 7474 is completely different pin out than a 4013, you cannot just substitute a different chip, even though they have similar functionality. Use a 4013.
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Old 9th February 2018, 05:20 PM   #497
alexkosha is offline alexkosha  United States
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DIY 4 Phase Sinewave Generator for Turntable Motor Drive
I see now. Thank you. I thought I picked up that one from our forum. It is my mistake. Thank you a lot.
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Old 9th February 2018, 11:34 PM   #498
alexkosha is offline alexkosha  United States
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DIY 4 Phase Sinewave Generator for Turntable Motor Drive
CD4013 is works like champ. Thank you.
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Old 10th February 2018, 11:09 PM   #499
chromenuts is online now chromenuts  United States
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I just wanted to express my gratitude to Bill for everything he has done to offer this project to the DIYAudio community. Thank you for your continued support and guidance with this and all your projects. It would have been easy to retire and move on to other things. Instead, you are here giving even more to the community than you had with your excellent commercial products. My little experimental system is finally back up and singing like it never has before with the completely rebuilt front end. Thank you.
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Old 15th February 2018, 03:58 PM   #500
Cyber5 is offline Cyber5
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I have just connected the Arduino rotary encoder & Pcb. all works fine if the encoder is turned slowly.clockwise = up / anti-clock = down frequency.

If I turn it fast or flick the encoder as fast as I can - the frequency keeps going as if the up/ down push button is pressed.
To stop the the frequency counting I just have to turn the encoder one notch.

Interestingly if I flick it fast clockwise the frequency decreases. anti-clock the frequency decreases.
But turning the encoder slow it works correctly. clockwise = up / anti-clock = down frequency.

Anybody come across this problem.
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