AVT 1634 Preamplifier & NE530 Kit: Eliminate Noise in 6W Speakers, Filters & Compatibility

Then maybe let's start over. I want to use only this preamplifier, what parameters the transformer would need (it will power: the preamplifier, the amplifier and the drive indicator Link I also found a toroidal transformer for 12V halogen and 6A performance, is it suitable or do I have to buy a new one?) what stereo amplifier should I choose for this preamplifier?

In my opinion, the preamplifier may be the source of noise. The TDA1524A chip was used there, which has extremely high noise. I built this preamplifier once and quickly gave it up because it was humming a lot.

First of all, I suggest checking what's humming, and not acting blindly.

korrus666 wrote:

In my opinion, the preamplifier may be the source of noise. The TDA1524A chip was used there, which has extremely high noise. I built this preamplifier once and quickly gave it up because it was humming a lot.

If a colleague says that the problem may be the preamplifier that project, I would like to abandon this project and make a new amplifier, maybe my colleagues will recommend some proven stereo system with volume control, speaker parameters as I wrote.

It wasn't me who wrote. And I do not recommend acting blindly - open your eyes instead of playing blindfold.

_jta_ wrote:

It wasn't me who wrote.

Sorry to make a mistake and miss it, I am already correcting it.

First we need to check what Kol wrote about.

Andrzej L. wrote:

The author of the thread did not write down what is happening in the listening session, how the preamplifier and the input of the final amplifier will be shorted to ground from the 530 kit.

If, after short-circuiting the input of the power amplifier, the noise stops (or significantly decreases), the fault lies in the preamplifier (TDA 1524 is a very bad circuit). If they are still at a comparable level - the power supply is to blame (as I wrote in the previously written post).
If the preamplifier is equally simple and two classes better, the LM1036 chip is better (except that if it is in KiT with AVT, then KiT AVT1670.- Basic application).
If the power supply is hum, you should get a conventional transformer and build a power supply on it. Remember that after rectifying the AC voltage, the effective value of the DC voltage will increase to about 1.41 times the effective value of the AC voltage.
To power the LM 1036, a stabilization system should be built - preferably on the LM 78 ** - the value (**) should be selected so that on the one hand it is not too low for the LM (see: http://pdf.datasheetcatalog.com/ datasheets2 / 34 / 348039_1.pdf - cannot be less than 9V), on the other hand, it cannot be too high (after the LM78 ** stabilizer) in relation to the voltage from the main power supply - the minimum voltage difference is 3V - in practice you can give a little more. Of course, the voltage of the main power supply (i.e. the transformer and rectifier) depends on whether the power amplifier circuit you have will be appropriate ...
So - above, you have a shortened version of the system of matching individual "blocks" when building an audio amplifier ...

You can also try to power the preamplifier from a battery - if then the noise becomes much lower, it means that the power supply hums and the filtering of the power supply for the preamplifier lets it pass through, or that there is feedback from the amplifier to the preamplifier through the power supply. You can also try to power the whole thing from a battery, battery, or a good low-noise power supply in case it is the power supply noise that causes the whole to malfunction.

The TDA1524 noise is a dozen or so dB higher than that of the LM1036. But I have the impression that they are so small that they should not be disturbing if you use a standard sensitivity end amplifier (1mW / 600? for full drive).

_jta_ wrote:

they are so small that they should not be in the way when using a standard sensitivity end amplifier

I reworked both the TDA 1524 and LM1036 chips (1035 too)
Noise from TDA is always - yes, it can be minimized (if one can say so ...) to the "catalog" value, but it is always there - regardless of the amplification. The LM circuit is built more "God's way" - the gain control takes place after the timbre (although partially also before), so the tone control setting does not affect the noise at low gain. It only really makes itself felt (noise) when the gain is set to about 3/4, but here it is masked by the music signal (if any).
Comparing both of these systems on the table, at the most optimal settings, it makes a huge difference - I did not believe that the company could release such a sell on the market and in addition still produces them ... Unfortunately - this system (TDA1524) is dedicated to a really low- demanding as to the quality of users.