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Chip Amps Amplifiers based on integrated circuits

vintage amplifier circuit board with TDA2010 with this tone/volume control circuit
vintage amplifier circuit board with TDA2010 with this tone/volume control circuit
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Old 1st December 2017, 01:16 AM   #1
Peters8 is offline Peters8  Italy
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Default vintage amplifier circuit board with TDA2010 with this tone/volume control circuit

Hi dear friends!
I need your precious support to realize a project that means a lot to me.
So I hope to get your very important support.
I've this old and simple amplifier based on two horrible TBA 810 (maximum power output for each channel about 4-5 watt (picture n.1)

Well, in the second picture, you can see the complete "naked" circuit board.

So my project is to take only all the frontal circuit board with the vu-meter, headphone/speakers switch, source switch and, of course, the tones and volume controls sliders (picture n.3).
Obviously I want to use only the frontal "pre" circuit board, removing the terrible and bad-sounding power amplifier circuit board, replacing it with a better (really hi-fi) amplifier circuit board based on a pair of TDA2010 (power output for each channel:12 watt rms/18 watt) (picture n.4, in the picture the two chips are without their original big heat sinks, but I'll add them when the project is complete).
Now my doubt is: is it possible to connect a very simple tone/volume control to an amp circuit board with two hi-fi chips like the TDA2010 ?
Now I'll add two pictures where you can see the electronic components welded on the "pre" circuit board, between the two pairs of sliders for the tone and volume control.
Very importantlease note that the tone control is unique (I mean: there isn' t a bass and a treble separated control, but just a single tone control for the right channel and another one for the left channel, the same system for the volume control: one slider for the right channel and another slider for the left channel).
The picture n.5 are the sliders for the tone controls (note the component in the middle of the two sliders, but there are other two ceramic capacitors up on the first slider(picture n.6), that are solded on the back of the circuit board with the audio signal input cable (picture n.7)
And, finally, the last picture (n.8), where you can see the electronic components between the two volume control sliders.
I know how to connect the two circuit boards...but my question is:
does this union of these two circuits works?
Plese help me! I need your support.
Thank you in advance for your kindness and your patience
Best regards

Last edited by Peters8; 1st December 2017 at 05:04 PM.
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Old 1st December 2017, 05:06 PM   #2
Peters8 is offline Peters8  Italy
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I'm sorry for my bad english!
However, please, help me!
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Old 1st December 2017, 05:14 PM   #3
Mooly is offline Mooly  United Kingdom
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vintage amplifier circuit board with TDA2010 with this tone/volume control circuit
It may be possible but you are going to have to 'busk' it (make it up as you go along).

One very important piece of information would be to knowing how the tone control is configured. It may be wrapped around the TBA810 as part of the feedback network, and if that is so then it can not be used independently.

If it is a passive network then it can be used.
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Old 2nd December 2017, 01:17 AM   #4
Peters8 is offline Peters8  Italy
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Hi Mooly!
First of all, thank you very much or your reply.
I'm a newbie, but a friend of mine explained to me the functions of the most important parts of this "volume-tone" control circuit board.
As you can see, this is the back of the circuit in question.
Note that, in this picture, you're seeing my second exemplar of this circuit board, so don't worry about the damaged parts where some the copper tracks are missing (for example the connection pins of the speakers, including the ground pin, in the middle.
In reality, I use this exemplar of this circuit board only for experiments and to photograph it to show it here.
In fact, I own another unbroken and undamaged exemplar of this circuit board that I keep in a drawer due to the fear that I can damage it:I will use it only for the final project.
However, I need to know your opinion about the union of these two circuits.
I hope so much the picture of the back of this volume-tone control unit can help you to advice me. I'm so confused :
That said, thank you very much for your kindness
Best regards
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Old 2nd December 2017, 01:52 AM   #5
PRR is offline PRR  United States
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You *need* the power transformer for the big-power chip board. Do you have that?

The vol/tone network appears to be simple passive. Go in at "phono", come out at "to amp". Optionally return amp to headphone jack.
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Old 2nd December 2017, 08:58 AM   #6
Mooly is offline Mooly  United Kingdom
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vintage amplifier circuit board with TDA2010 with this tone/volume control circuit
It is difficult just working from pictures... not the same as having it in front of you.

I think you need to take this in stages.

1/ Rig up a suitable volume control, power amp (any power amp) and speaker. Feed it with a line level signal and make sure it works.

2/ Now add your tone/volume board before the volume control and make sure it works as intended.

The descriptions your friend has put on the board look reasonable so use the turntable input which appears to be the thin two core wire + shield in your second picture.

3/ Take the output from where you have marked 'to amplifier'.

Test it and make sure tone and volume work. That is the first step.

Your second picture also seems to show what appear to be two zener diodes near the meter. I can't say what they are from just pictures. Are they power supply related ? or simply part of a passive VU rectifier (and maybe not zeners).

A lot of unknowns I'm afraid
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Old 4th December 2017, 10:27 PM   #7
Peters8 is offline Peters8  Italy
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Thank you my friends for your support, unfortunately in these days I had flu (and I still have flu.
So I could not do any experiments.
I'll keep you informed about this project as soon as possible.
Best regards
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Old 4th December 2017, 11:04 PM   #8
Peters8 is offline Peters8  Italy
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Ah Mooly, I was forgetting your question about the two components under the vu-meter.
I've removed the vu-meter from the circuit board (the second exemplar for the experiments) and I've discovered the two components you was talking about, are two "1N4"...they are "silicon power zener diodes" (I've just read it!)-
They are connected to the vu-meter's pins.
Please be patient with me, dear Mooly: could you explane to me their fuction?
I'm just a newbie but I love this world!;
Thank you very much!
regrds
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Old 5th December 2017, 05:15 AM   #9
PRR is offline PRR  United States
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They are almost certainly 1N4148 (peek around the side), which are small signal (not Zener, not Power) ordinary diodes suitable for turning the audio "AC" from the speaker lines into DC for the meter.
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Old 5th December 2017, 07:05 AM   #10
Mooly is offline Mooly  United Kingdom
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vintage amplifier circuit board with TDA2010 with this tone/volume control circuit
Yes, I would concur with PRR having looked at the second image although you typically need two diodes per meter......

This is why working from images is difficult

This shows the basic passive VU circuit (its crossed out in red because it is considered a bad design).

C1 blocks any DC present.

D1 is a clamp and conducts on the negative part of the waveform, effectively removing it by shorting it out.

D2 passes the remaining positive peaks to capacitor C2 which charges up to the peak voltage. This voltage drives the meter.

The trouble with these simple circuits is that they are very insensitive and do not work at all with low level input voltages.

Hope you are feeling better soon
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