META42 Blue Portable pix
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MacDEF

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Just thought people might be interested in a few pictures. This is a KurtW-built META42 portable amp with the following specs (thanks, Kurt!):

- AD8620 dual op amp
- Cascode FET current sources to operate the opamp in Class A mode
- 2 EL2001 buffers per channel
- EL2001 buffer in power supply with TLE2426 railspliter
- Power supply: 4 470uF electrolitic caps, as well as 2 6.8uF and 2 0.1uF Wima poly caps
- 10 Amp Crowbar diode to protect against a reversed battery
- DC-coupled circuitry
- Sockets for all ICs and "tweakable" resistors
- Blend resistor (a bit like a crossfeed circuit)
- White LED (with socketed resistor to adjust the brightness)
- Output resistors replaced with jumpers (using sockets so you can put resistors back in if desired)


FRONT VIEW:



ANOTHER FRONT VIEW:



TOP VIEW (the LED is on, but a bit hard to see because of the flash):



IN-USE VIEW -- in a HeadRoom AirBag with a Panasonic CT570 (that's the PCDP remote sticking out):
 
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andrzejpw

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Very nice amp! Once I get a digicam, I WILL post pics of mine. I know guys, I know, I've been promissing for a while. . .
 
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rickcr42

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Colors ! We LIKE Color !


White LEDs , can blind a man if not careful.I use 'em but at WAY reduced intensity,same with the 'blues".Pretty but way too bright.

Not having actually touched a soldering iron in months (OK.I DID repair a headphone cord) I have not done much with chassis/cabinet'enclosure design but when I DO , I am definately gonna do some color.

Looking into some Hammertone colors (blue,green,gold) for my next metal chassis amp , portable amps are'have been set for some time-no need to do more (of course there is Christmas coming up
)

still waitin' for the review dammit
 
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acs236

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What batteries does it use?
 
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andrzejpw

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I think I see a 9 volt in there. . . Duracell?


Blue leds rock
 
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JMT

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Those Serpacs are very cool enclosures. That one looks like my travel amp, only mine is translucent red. Nice work Kurt!
 
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RickG

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Very nice, Kurt/MacDEF. It looks very similar to the one JMT built for me a while back.

Enjoy!

 
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HighwayStar

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Sweet amp Mac, inside and out. And nice travel rig there
 
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lextek

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Quote:

Originally posted by JMT
Those Serpacs are very cool enclosures. That one looks like my travel amp, only mine is translucent red. Nice work Kurt!


Do they make a smoke color?
 
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lextek

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So how does it sound?
 
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MacDEF

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Quote:

Originally posted by rickcr42
White LEDs , can blind a man if not careful.I use 'em but at WAY reduced intensity,same with the 'blues".Pretty but way too bright.


Yeah, the white light is bright, but Kurt put a socketed resistor in there so I can adjust the brightness as desired
The nice thing about using a white one is that it's bright enough for me to see from the FRONT of the amp when it's in the AirBag (as shown in the travel rig picture).


Quote:

Originally posted by andrzejpw
I think I see a 9 volt in there. . . Duracell?


Currently, yes. Kurt suggested a specific rechargeable, but I haven't had a chance to get one, yet.
 
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kelly

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I assume you mean the plainview.


Thanks for posting the pics, MacDef. Knowing Kurt's attention to detail, I'm sure it performs very well.

I wish someone would make a case like those that had a battery hatch.
 
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puppyslugg

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Quote:

I wish someone would make a case like those that had a battery hatch.


And fits 2-9v batteries.
 
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KurtW

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It has a battery hatch for one 9 volt battery. I never found the need for higher voltages, although there seems to be a following for two 9v batteries.
 
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carlo

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mac,
cool


kurt,
i love the placement of the led under a translucent case man. would you mind sharing some info about the "tweakable resistor" sockets? are they in the signal path or for the brightness of the led? i was thinking about using a socket in a project to aid with resistor comparisons, but didn't know if there was any sonic effect (or to what degree). your opinions would be much appreciated.

best,
carlo.
 
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