Hello
My first post on PFM so hi everybody!
Few years ago I bought 8 of NCC200 power amplifiers PC board kits and got great success with them.
By the way I'm talking about the old, single-sided ones.
Right now I have two left of these.
And I have a project for them.
I want to build myself an Audio Lab amp using two paralleled NCC200 with the following features.
1) The amp needs to approach an almost perfect voltage source so power needs to double as impedance is halved, right to 2 Ohms.
2) Output impedance of the parraleled amps should be below .01 ohms for at least half of the available output voltage, all this from 10 to 40KHz.
2) I don't ask for lot of power...only 50-60 watts total, considering with the two amps paralleled, which are powered from low DC voltage supply but lots of current...from 6.7 Amps AC from transformer.
So this means 20 Vrms output but it has to stay 20 V down to 2 Ohms.
3) I will get a 320VA toroidal Transformers with 48Vct/6.7 amps with generous capacitance.
4) The last amps I built with the others had a low offset error below 5mVdc and gain precision better than 0.1dB and I will surely get these specs for this project.
5) I understand I will need to couple the two amps together through a pair of 0.22 Ohms(???) resistors.
Am I on a good track?
Anything you could suggest to help?
Thanks!
Lucky Luke
My first post on PFM so hi everybody!
Few years ago I bought 8 of NCC200 power amplifiers PC board kits and got great success with them.
By the way I'm talking about the old, single-sided ones.
Right now I have two left of these.
And I have a project for them.
I want to build myself an Audio Lab amp using two paralleled NCC200 with the following features.
1) The amp needs to approach an almost perfect voltage source so power needs to double as impedance is halved, right to 2 Ohms.
2) Output impedance of the parraleled amps should be below .01 ohms for at least half of the available output voltage, all this from 10 to 40KHz.
2) I don't ask for lot of power...only 50-60 watts total, considering with the two amps paralleled, which are powered from low DC voltage supply but lots of current...from 6.7 Amps AC from transformer.
So this means 20 Vrms output but it has to stay 20 V down to 2 Ohms.
3) I will get a 320VA toroidal Transformers with 48Vct/6.7 amps with generous capacitance.
4) The last amps I built with the others had a low offset error below 5mVdc and gain precision better than 0.1dB and I will surely get these specs for this project.
5) I understand I will need to couple the two amps together through a pair of 0.22 Ohms(???) resistors.
Am I on a good track?
Anything you could suggest to help?
Thanks!
Lucky Luke