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Amp Camp Amp - ACA
Amp Camp Amp - ACA
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Old 4th December 2013, 06:33 PM   #1501
speedless is offline speedless  Denmark
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Quote:
say 15V is lowest value you can even think of
Hi
What would be highest value ?

Jan
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Old 4th December 2013, 06:56 PM   #1502
6L6 is offline 6L6  United States
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Amp Camp Amp - ACA
I know Nelson has talked about 24V, but past that you need to watch the voltage ratings of the capacitors.
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Old 4th December 2013, 10:49 PM   #1503
cochleus is offline cochleus  United States
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Quote:
Originally Posted by ejfud View Post
the first amp is finished!
Bravo, I like the design. Thanks for the pics.
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Old 5th December 2013, 10:34 AM   #1504
speedless is offline speedless  Denmark
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Quote:
I know Nelson has talked about 24V, but past that you need to watch the voltage ratings of the capacitors.
Hi
Thanks.
Voltage range:15-24V,correct ?

Jan
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Old 6th December 2013, 02:35 AM   #1505
sachu888 is offline sachu888  India
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Changed the charger and its working as it should be.

Regards,
Sachin
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Old 7th December 2013, 09:10 PM   #1506
NYCOne is offline NYCOne  United States
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A quick note, I posted pics of my ACA build in the: Pictures of you DIY Pass amplifier thread if anyone is interested.
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Old 8th December 2013, 03:36 AM   #1507
kiven chen is offline kiven chen  China
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Quote:
Originally Posted by speedless View Post
Hi
Thanks.
Voltage range:15-24V,correct ?

Jan
Yesterday I tried to use low DC8.5V until today also work correctly.Replace Q1 2SK1058 (g-1.4V).
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Old 9th December 2013, 06:34 AM   #1508
gabbar is offline gabbar  United States
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Default Homemade single sided ACA

My homemade version of ACA. Single sided PCB, much easier to make that double sided.
PCB specs : 4inch x 2inch, FR4 2oz.

PCB's with just the photo laminate on (before etching)
IMG_1041.jpg

Etched PCBs
IMG_1049.jpg

With solder mask and all holes drilled.
IMG_1056.jpg

Getting the parts laid out.
IMG_1059.jpg

Up and running. Didn't have the 3W resistors so used some .22Ohm/5W to make up the required values.
Sounds awesome !! Absolutely no hiss/hum.
IMG_1063.jpg
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Old 9th December 2013, 10:14 PM   #1509
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by gabbar View Post
My homemade version of ACA. Single sided PCB, much easier to make that double sided.
PCB specs : 4inch x 2inch, FR4 2oz.



Up and running. Didn't have the 3W resistors so used some .22Ohm/5W to make up the required values.
Sounds awesome !! Absolutely no hiss/hum.
It looks great, and I really like etching one's own PCBs.

One thought, you might move the Rg closer to the FET. This is something I didn't do in my early PCBs and I've gone back and made the changes (jumper and Rg on the FET) to control parasitics.
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Old 11th December 2013, 06:18 PM   #1510
6L6 is offline 6L6  United States
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Amp Camp Amp - ACA
Modification instructions -

The current PCB have been found to be needing one extra resistor added to get the bias set to a range where the amp will make itís full designed power. This is a minor compensation for the particular small-signal transistor (ZTX450) and will be integrated into new revisions of the PCB. In the meantime, you will need to add this resistor above the PCB.

It is going to be very helpful to have a 2nd person to help you hold things in place as you solder.

The end result should look like this -

Click the image to open in full size.

Click the image to open in full size.
First take the 2.2K resistor and bend the lead around a small screwdriver.

Click the image to open in full size.
The resistor will go here - donít cut anything yet, but try to bend the leads so they go in the approximate correct location.

Click the image to open in full size.
Trim and solder

Click the image to open in full size.
Be sure that the resistor lead touches only the first leg of the transistor.

Click the image to open in full size.
With the other end attached to the transistor, bend and trim the opposite lead.

Click the image to open in full size.
Solder. Repeat on other amp channel.
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