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Old 18th February 2010, 05:39 PM   #21
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Originally Posted by Mooly View Post
You can compare headphone specs here, and choose by impedance/make/type etc
Your Search Results | CPC
On the contrary thank you for that great link

I have always been partial to Sennheiser headphones ever since i had a pair of HD414 back in the day. Looks as though i need to get a listen to either of the HD515, 555 & 595. I can just bet there will likely be none in stock in this place though, no i'm wrong - John Lewis stock the 515

Again, thanks for the link Mooly
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Old 23rd February 2010, 12:21 PM   #22
Mooly is offline Mooly  United Kingdom
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Still playing around with the layout... exceeded the 250 pin limit on Diptrace lol... but you can still place pads one at a time... yea

This is looking like the final design. Need to check that the sockets, pot and switch etc will all position perfectly to allow the PCB to slot into the rather nice case.
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Old 7th March 2010, 06:10 PM   #23
Mooly is offline Mooly  United Kingdom
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Default It all works, and sound quality is outstanding.

It's getting there slowly...
PCB assembled... all worked first time... yea.

Just gave it a quick listen... wow this is good. And it's so quiet too.

Next will be the case etc... that's the bit I don't like doing.


The mutiturn pot (between the battery and transformer) allows the low battery warning to be set accurately. The small push tact switch is illuminated (Red L.E.D.) and this begins to flash when the battery pack needs charging. You will see why I settled on red rather than blue hopefully in the next installment.
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File Type: jpg IMAG0021.JPG (149.7 KB, 910 views)
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Old 7th March 2010, 06:26 PM   #24
Obe1 is offline Obe1  United States
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You are really something!

Best regards & good listening,

Obe1
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Old 8th March 2010, 06:02 AM   #25
Mooly is offline Mooly  United Kingdom
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You are really something!

Best regards & good listening,

Obe1
Hi Obe1 and thank you

This amp will hopefully allow me to evaluate some different "front end" circuitry in future. Input stages, tone controls, solid state switching etc.

Is it giving you ideas ?
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Old 8th March 2010, 09:34 AM   #26
poynton is offline poynton  United Kingdom
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Hi Mooly

I just found this thread. Maybe it will give me something to use up my supply of reclaimed trannies !!

Was the choice of transistors deliberate of governed by what you had in the junk box ???


Andy
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Old 8th March 2010, 06:21 PM   #27
Mooly is offline Mooly  United Kingdom
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Was the choice of transistors deliberate of governed by what you had in the junk box ???
Andy
Hi Andy,
Errr... the latter
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Old 8th March 2010, 06:36 PM   #28
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Hi Mooly, i meant to leave a comment yesterday but i was short of time as i went out...

Very neat indeed, i wish i had time to make my own PCBs but alas i'm a veroboard man Nothing wrong with the stuff when it's layed out correctly though

You got exactly what you wanted Even though your efforts should have reminded me i have still managed to get into town 3 times lately & i have still forgotten to get a listen to some Sennheiser cans

All the best & enjoy, Mark.
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Old 8th March 2010, 06:46 PM   #29
Mooly is offline Mooly  United Kingdom
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Thanks Mark...
now write down,
SENNHEISER, SENNHEISER, MUST NOT FORGET
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Old 8th March 2010, 07:58 PM   #30
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You got exactly what you wanted Even though your efforts should have reminded me i have still managed to get into town 3 times lately & i have still forgotten to get a listen to some Sennheiser cans
Memory is the second thing to go with age. I forget what the first one was...

(Lurking here because I have a large collection of germanium transistors, including power types such as AC127/AC128, OC28 and OC35.)
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