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Designing my headphone amp
Designing my headphone amp
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Old 13th July 2021, 11:05 AM   #151
dreamth is offline dreamth  Romania
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Join Date: Nov 2010
welll this is your 7th month in this project...
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Old 13th July 2021, 11:22 AM   #152
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
The amp is for me - learnt every day (also covid and work has got in the way)
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Old 13th July 2021, 04:23 PM   #153
NickKUK is offline NickKUK  United Kingdom
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So this is doing B+/B- 320V at 250mA.

Screenshot 2021-07-13 at 17.20.59.png

I'll check with the PSU folks if there's any issues in connecting like this.
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Old 14th July 2021, 01:26 AM   #154
thuanth43 is offline thuanth43  Singapore
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Could that psu go up to 400v? Would be a good supply for electrostatic headphone amp.
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Old 14th July 2021, 01:59 AM   #155
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
Quote:
Originally Posted by thuanth43 View Post
Could that psu go up to 400v? Would be a good supply for electrostatic headphone amp.
The concept - yes.

The main thing I need to check is ensuring equal voltages on start up and shutdown.
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Old 24th July 2021, 05:48 PM   #156
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
So after all the consideration for layout.. note the edge of the red is the centre... not the middle!

IMG_8684.jpg

I'll sort out the mounting holes tomorrow and then I can start really putting stuff inside.

I decided to move the driver tube into the centre.. no real issue with the implementation, but solves that 'missing hole' feel.

Last edited by NickKUK; 24th July 2021 at 06:11 PM.
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Old 25th July 2021, 04:11 PM   #157
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
Hacking away at the prototyping case..

All the V1 sockets attached - I can now start really installing bits inside..
IMG_8688.jpeg

I will have to get myself a few more tubes... In the original single ended configuration..
IMG_8692.jpeg

However this is what V1 will look like.
IMG_8691.jpeg

The pond project is the first priority, this is second but we're getting there..

I found my yellow/green solid wire is 1.3mm diameter.. so way thick enough for heater wire Plan is now that yellow/green twisted is heaters rather than using brown.

Last edited by NickKUK; 25th July 2021 at 04:14 PM.
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Old 25th July 2021, 04:39 PM   #158
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
The cap layout will be something like this:

IMG_8694.jpg
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Old Today, 12:32 PM   #159
NickKUK is offline NickKUK  United Kingdom
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Join Date: Dec 2019
Just been sorting out the power transformers and inductors.

Unfortunately Terry (Cantebury Windings) isn't taking on new work for 2 months.

I thought about Toroidy in Poland but they have a comment on their website for longer delays for orders given the current copper issues.

So I had a chat with Stephen at Tiger Transformers today. This looks very promising. I've also over specced the transformers to allow me to use them for other project prototypes (ie the RF tube digital amp).
These will be wound on over sized cores, with insulation and banding, but I will have two separate transformers for the B+ (each having two isolated secondaries to work with the regulators).
He also had a good solution for the heater supplies too and I should find out about the 9H chokes later this week.

They're custom but they don't break the bank. I'll confirm everything later this week and then put an order in.
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