Maida Regulator PCB - Page 2

SpreadSpectrum · 28th January 2012, 08:53 PM

I just placed the order. According to the website, they should be done on Feb. 6.

wicked1 · 11th February 2012, 04:20 PM

Any news on these?

SpreadSpectrum · 04:45 PM

Yeah, I have not recieved them. They gave me conflicting information when I ordered. They said they'd be done by Feb. 6 and they also had a note saying the factory would be down from Jan 20 to Jan 31 due to the Chinese new year. I'll email them and see if they have a new ETA. My guess is that they have a bit of a backlog from taking a couple of weeks off.

wicked1 · 11th February 2012, 08:13 PM

Ok, thanks..
Gotta say, Chinese new year messes up my amp projects almost every year! I've only got a few months each year where I've got time for these projects.. Then by the time I bring myself back up to speed and figure out what I want to build it's about this time.. Then orders are all delayed.. Then by the time they're back to work and get my order processed and shipped it's spring and my garden and home projects take priority.. then next year I'll have lost interest in this project and moved on to a new idea, and the cycle repeats!!!!!

Brett · 11th February 2012, 08:25 PM

Quote:

Originally Posted by SpreadSpectrum

The next board I have to make is an automatic fixed bias board for push-pull amps based on a John Broskie circuit.

This sounds interesting too. Which circuit?

SpreadSpectrum · 11th February 2012, 09:30 PM

The master would be biased with a circuit similar to the first circuit shown in this blog entry: Amplifier auto bias circuits: Alan Dower Blumlein's garter circuit, it's the 'Broskie auto-bias circuit.'

The slave would just mirror that with an op-amp and a high voltage transistor.

SpreadSpectrum · 14th February 2012, 02:40 PM

Boards shipped today and are expected to arrive Thursday. I expected them to take longer in shipping coming from China and all.

wicked1 · 14th February 2012, 05:19 PM

The bias board sounds interesting! I just adjusted a PP amp last night, that had drifted out of balance, and the difference is amazing. It sounds a LOT better w/ all the tubes biased properly.
Hurry up! (j/k)

SpreadSpectrum · 14th February 2012, 06:34 PM

I am building a push-pull amp with plitron output transformers which everyone says are sensitive to DC imbalance. I always thought it would be nice if the amp biased itself(and I like fixed bias). I read Broskie's article and thought I would put the circuit to the test. He seems to think it is pretty good, but I don't know if he ever actually built it. I've got the board all laid out, I just wanted to test this board house since they are so affordable. Hopefully these come back nice.

CharleyW · 15th February 2012, 02:00 AM

Several have built it and swear by it.

11th February 2012, 04:42 PM	#13
SpreadSpectrum diyAudio Member Join Date: Nov 2007	Yeah, I have not recieved them. They gave me conflicting information when I ordered. They said they'd be done by Feb. 6 and they also had a note saying the factory would be down from Jan 20 to Jan 31 due to the Chinese new year. I'll email them and see if they have a new ETA. My guess is that they have a bit of a backlog from taking a couple of weeks off. Last edited by SpreadSpectrum; 11th February 2012 at 04:45 PM.

15th February 2012, 02:00 AM	#20
CharleyW diyAudio Member Join Date: Aug 2002 Location: Arlington, TX	Several have built it and swear by it. __________________ Hey is for horses.

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28th January 2012, 08:53 PM	#11
SpreadSpectrum diyAudio Member Join Date: Nov 2007	I just placed the order. According to the website, they should be done on Feb. 6.

11th February 2012, 04:20 PM	#12
wicked1 diyAudio Member Join Date: Jan 2008	Any news on these?

11th February 2012, 08:13 PM	#14
wicked1 diyAudio Member Join Date: Jan 2008	Ok, thanks.. Gotta say, Chinese new year messes up my amp projects almost every year! I've only got a few months each year where I've got time for these projects.. Then by the time I bring myself back up to speed and figure out what I want to build it's about this time.. Then orders are all delayed.. Then by the time they're back to work and get my order processed and shipped it's spring and my garden and home projects take priority.. then next year I'll have lost interest in this project and moved on to a new idea, and the cycle repeats!!!!!

11th February 2012, 09:30 PM	#16
SpreadSpectrum diyAudio Member Join Date: Nov 2007	The master would be biased with a circuit similar to the first circuit shown in this blog entry: Amplifier auto bias circuits: Alan Dower Blumlein's garter circuit, it's the 'Broskie auto-bias circuit.' The slave would just mirror that with an op-amp and a high voltage transistor.

14th February 2012, 02:40 PM	#17
SpreadSpectrum diyAudio Member Join Date: Nov 2007	Boards shipped today and are expected to arrive Thursday. I expected them to take longer in shipping coming from China and all.

14th February 2012, 05:19 PM	#18
wicked1 diyAudio Member Join Date: Jan 2008	The bias board sounds interesting! I just adjusted a PP amp last night, that had drifted out of balance, and the difference is amazing. It sounds a LOT better w/ all the tubes biased properly. Hurry up! (j/k)

14th February 2012, 06:34 PM	#19
SpreadSpectrum diyAudio Member Join Date: Nov 2007	I am building a push-pull amp with plitron output transformers which everyone says are sensitive to DC imbalance. I always thought it would be nice if the amp biased itself(and I like fixed bias). I read Broskie's article and thought I would put the circuit to the test. He seems to think it is pretty good, but I don't know if he ever actually built it. I've got the board all laid out, I just wanted to test this board house since they are so affordable. Hopefully these come back nice.

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