I wanna make a mixer, but not sure how....
What I want is just to combine all inputs (likely to be 4 inputs) and output to two speakers.

Should I consider it as a power amplifier?
Or is it too difficult to a beginner like me?

Thanks in advance!

Please forgive me if I have posted at the wrong place.

I have tried using a car battery (12V 17Ah) to power on a Spider III amp. I use an inverter to convert 12 to 230Vac and turn. For guitar, I used an electric acoustic for testing.
It works, but the problem is that static noise is heard.

When I lower the volume output of my guitar, the static noise is smaller. When increased, static noise output increases too.
I have also tested using 230Vac from wall, it does not have static noise output. So I think at least it is not introduced by the jet and my guitar. And I am guessing the noise is introduce due to the fan on the inverter.
I have tested the voltage for the inverter output. It does not reach 230, but 190 (AMP is turned on). Not sure if this will affect the performance of the AMP.

Is the something I can do except replacing a better inverter? Or is it inevitably noise will be introduced in this configuration?

Dear all,

   I was planning to use TDA2030 to build an amp which have separate frequency band amplification. In this way, I can get higher power output without using ICs like LM3886 together with large heat sink. I plan to use TD2040's datasheet's suggested circuit to give two output : one to woofer and one to tweeter. Or maybe I can cascade several TDA2040 to give higher power output.
   The problem is that this IC is for Hi-fi, and the suggested frequency band of interest is not suitable for a guitar amp. I would like to know what frequency band are of interest to guitar so that I can keep using that circuit.

Thanks in advance!

My friend has an Ovation guitar and its has been broken -- no sound output to the amp.

There are only two things left not checking.

1. Pickup -- I have no idea how it works nor do I have any method to test whether it works
2. Built-in Equalizer -- coz the screw are inside, I don't have tools at hand that can unscrew it in the limited space

I assume the equalize is in good shape. This is becoz there is a battery button to test whether there is power and it lights up when I press it.

Is there any way to test whether the pickup is working or not?
Is it good to buy a new pickup to replace the old?

Please forgive me for placing the wrong section since I dunno where to post this question.

I wanna make a DIY guitar amplifier with reverb function built-in. However, when I search the web, it seems that reverb need a spring device in order to make the effect.

Is there any other method to make a reverb? Since I am very new to guitar also, I hardly able to distinguish delay and reverb.

Thanks for your attention!

I am not sure if here is the right place to ask this question. Forgive me if I am wrong.

All I have tried making is a Ruby AMP. And there is one more make use of the chip TDA2008. (Both are powered by 9V batteries)

Afterwards, I would like to add effects : Tone control circuit, Reverb, Delay... etc. But before that, it seems adding a tuner will be quite convinient. In this way, I do not need to plug out the cable to the tuner and plug the cable in the AMP after tuning.

Do anyone know how to embed a tuner to an AMP?

( Sorry if i am too aggressive to try making all things DIY. )

   I am new to here and new in making guitar amps. I wanna make a guitar amp that can be used outside, where you can't possibly find a plug to plug in. As a result, I don't know how to start off.

  Feel free to comment. Thanks.