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Marsh headphone amp from Linear Audio
Marsh headphone amp from Linear Audio
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Old 19th May 2019, 05:14 PM   #1621
Carl_Huff is offline Carl_Huff  United States
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Join Date: Dec 2004
Location: Bakersfield, CA
Quote:
Originally Posted by rsavas View Post
Looks good Carl.
Might want to move the inputs (or have the option) to the other end further away from the AC input. Might not be enough room for the connectors/pots you have chosen :-) just an idea.
Not enough room to move items on the backside and still fit in the Hammond enclosure. I have used that IO and power scheme before. There is no room but it works well enough.
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Old 19th May 2019, 06:06 PM   #1622
Wdsport is offline Wdsport  United States
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I just built the pcb provided by Jack, its a nice board thanks to Jack. It came as a kit with all the parts. Sounds great!
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Old 20th May 2019, 03:26 AM   #1623
eljoantonyn is offline eljoantonyn  India
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Quote:
Originally Posted by rsavas View Post
I see that Mouser has all the semi's in thru hole.
Does anyone have a pcb for this design?
I was thinking of making one, I will buy the article from LA.
You may contact Jack.


Glad to know that everything is available from Mouser.
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Old 20th May 2019, 11:25 AM   #1624
eljoantonyn is offline eljoantonyn  India
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Well, I'm ordering parts from Mouser and I'm sort of lost.

I don't have any background in electronics and would love to have some help to select the right part @Mouser.


So, here it goes!

Quote:
1. 100nF ceramic cap:
Is it regular ceramic vs MLCC ?
Is it a "feed through capacitor" ?
Whats the material of Dielectric ? X7R ?
Voltage rating ?
Radial type, right ?


2. 220uF Electrolytic:
Voltage rating ?
Low ESR, Audio grade ?
Which brand, Panasonic or Nichicon or UCC ?



3. 1N914:
Just a plain jane version or a more exotic one ?
Is it a "rectifier" or a "switching" type ?


4. Header 1x2:
I'm lost here as there are tonnes of options in Mouser.

Is it a power connector ? What exactly it do ?


5. Header 1x3

Similar questions !


6. Bourns POT 1 (102R):
Not available in Mouser.


7. Bourns POT 1 (201R):
Not available in Mouser.
BTW, is it OK to ask these questions here ?
Please let me know I have a lot more to ask :P
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Old 20th May 2019, 01:13 PM   #1625
Mark Johnson is offline Mark Johnson  United States
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Location: Silicon Valley
Marsh headphone amp from Linear Audio
Don't be intimidated, ordering parts from Mouser is not unbearably difficult. Here is the procedure that I myself would use, to order item #3 from your list. Perform the steps in alphabetical order: A, B, C, D, E, F, G, H.

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Old 21st May 2019, 12:55 AM   #1626
Wdsport is offline Wdsport  United States
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Location: Mobile Ala.
The actual pcb board that will be used should be considered too. The headers, spacing of the electrolytic caps for example will be based on the board you have. Take into account also with the headers the type of connections needed to mate with them. Voltage for any part should be at least 24v. My 220uf are Panasonic fm low esr 63v. The diodes should be normal type. The pot should be bourns, cheaper ones I have used are noisy at times and can go bad/faulty just from light adjustments. Watch out for the output stage resistors (r11,12,13,14,16) they need to be 1 watt rated at least, they can get warm with normal use.
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