Does anyone know the gain of the amplifier I put in the link and how can I change the gain and what is the power supply voltage rating minimum. I need a high input impedance for electric guitars and I have to use it as microphone amplifiers also. I ordered them on eBay and it is coming from China. It shows that it has a socket: does it really have a socket in case I have to change the IC? https://www.ebay.com/itm/1551974393...mbBPJL-Rgm&var=&widget_ver=artemis&media=COPY

 

You could have read the link:

Description
1. Working voltageC 12-35V
2. Working current:about 600mA
3. Gain:5 ( It will be 10 gain after change R5 and R6 to 100K ohm)

 

You could have read the link:

I only can provide 10 milliamps or less at 12v. Also I need a gain of five and 200, what do I do? I don't believe it uses 600 milliamps, that's enormous. Do you have a schematic? How much gain is needed for an electric guitar for line level output, I'm thinking five x.

 

Sorry, I’m done with someone who doesn’t even bother to read the link they posted, expecting someone else to do it for them.

 

I need a high input impedance for electric guitars

Then don't use a NE5532. The current noise is too high.
Use a JFET input op-amp.
When used as a microphone preamp, it won't be quite as good as an NE5532, but it will be much better for guitars.
But won't you be needing a balanced input for the mics and a single-ended input for the guitar?

It shows that it has a socket: does it really have a socket in case I have to change the IC?

Yes- so you can take out the fake and put a real one in!

 

Sorry, I’m done with someone who doesn’t even bother to read the link they posted, expecting someone else to do it for them.

Don't give up on me so easily Bob, I'm a schizophrenic and I don't like to be controlled by the truth but rather my intuition. I believe the physical evidence changes in real time so I don't know what to trust and what to respect or regard. When I ignore something it's because I don't have confidence in information. Shouldn't we help each other with weaknesses? I'm not compelling you to help me. I guess you didn't like me doubting 600 milliamp of consumption.

 

Sorry, I’m done with someone who doesn’t even bother to read the link they posted, expecting someone else to do it for them.

Then don't use a NE5532. The current noise is too high.
Use a JFET input op-amp.
When used as a microphone preamp, it won't be quite as good as an NE5532, but it will be much better for guitars.
But won't you be needing a balanced input for the mics and a single-ended input for the guitar?

Yes- so you can take out the fake and put a real one in!

I'm making the microphone circuit single ended that's why I chose the board that I ordered from eBay. If the IC is fake may the spirit correct IT for me. In this way the vendor will not be blamed. Death does not change and that is why the physical does not transform on its own with thought to correct any problem using will. I have several LF353 integrated circuits that hopefully I can substitute for low current consumption.

 

LF353 would certainly be better for the guitar inputs, and would do an adequate job for the microphone.

 

The Chinese circuit has the IC part number sanded off so it probably is a fake. You get no schematic and no audio specs with the circuit.
The old NE5532 was made to be a preamp for a record player (remember them?) so its minimum input impedance of 30k is much too low for an electric guitar that usually needs 1M or higher.

A gain of 5 or 10 is good for an electric guitar but the gain for a mic should be 50 to 200.

 

The Chinese circuit has the IC part number sanded off so it probably is a fake. You get no schematic and no audio specs with the circuit.
The old NE5532 was made to be a preamp for a record player (remember them?) so its minimum input impedance of 30k is much too low for an electric guitar that usually needs 1M or higher.

A gain of 5 or 10 is good for an electric guitar but the gain for a mic should be 50 to 200.

You think I could change the gain of the 5532 amplifier to 200 for the microphones. Thank you for telling me the gain of the guitar (5-10).

 

LF353 would certainly be better for the guitar inputs, and would do an adequate job for the microphone.

If the noise is a problem on the LF353 for the microphone amplifier, I don't mind because the noise is evidence of hidden love that must be revealed to reality that God is responsible for. I'm cool with that (LF353 performance). Can I just swap them?

 

The Chinese circuit has the IC part number sanded off so it probably is a fake. You get no schematic and no audio specs with the circuit.
The old NE5532 was made to be a preamp for a record player (remember them?) so its minimum input impedance of 30k is much too low for an electric guitar that usually needs 1M or higher.

A gain of 5 or 10 is good for an electric guitar but the gain for a mic should be 50 to 200.

Stop your animosity and play fair with the Chinese. America should not put countries at a disadvantage but they must admit they're doing this. I'm certain aliens would appreciate this. Or you don't believe in aliens.

 

Stop your animosity and play fair with the Chinese. America should not put countries at a disadvantage but they must admit they're doing this. I'm certain aliens would appreciate this. Or you don't believe in aliens.

Don't believe in aliens, and I believe we should treat countries who wish us ill with a jaundiced eye.

 

I don't mind because the noise is evidence of hidden love that must be revealed to reality that God is responsible for.

So that's where 1/f noise comes from?

 

So that's where 1/f noise comes from?

Maybe 1/(1/f)=Level of love. Inversely proportional.

 

When we discuss electronic circuits, we do not talk about politics or God.
Maybe the very cheap preamp with the part number of its IC sanded off was not made in China, ebay says it is unbranded and generic. Why did aliens who made it sand off the IC part number?

 

When we discuss electronic circuits, we do not talk about politics or God.
Maybe the very cheap preamp with the part number of its IC sanded off was not made in China, ebay says it is unbranded and generic. Why did aliens who made it sand off the IC part number?

Maybe the IC has been redesigned through some type of transformation when created and does not correlate with the truth of the original part number. So to avoid inaccurate control of the aliens, the aliens have to erase the part number so that belief in truth does not control them physically that would cause them harm since the mental image does not correspond to the physical image of the part as it is observed to form an equal complementary. The aliens are trying to protect themselves from harm.

 

I never buy cheap unbranded generic junk from ebay aliens. Instead I buy properly made and described electronic items made by engineers at Name Brand well known companies.

 

I never buy cheap unbranded generic junk from ebay aliens. Instead I buy properly made and described electronic items made by engineers at Name Brand well known companies.

Well audio guru, if you're poor you may not have a choice.

 

A good education gets you a well paid job.
My government brings poor refugees to my country, gives them a hotel, food and a job.
I am old (78) and retired so I do not have a job anymore. My government pays me to do anything I want to do because for many years I paid them taxes.
All my medical bills and medications are paid by my government.
The value of my home, investments and bank accounts keep growing.