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RTR BTSB Panel Mount Buffer GB

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#21
This buffer was really designed for the OPA1656 which has FET input gates and circa 10pA input bias current and 100mA current output. The OPA1612, while lower distortion, has a BJT input gate and about 1000x higher input bias current and 30mA output current drive.

All of this is to reduce the THD by about 2x less down from 0.000029% to 0.000015% and overall lower noise from about 3mV/sqrt(Hz) to 1nV/sqrt(Hz).

I don’t think it’s worth it for the reduced output current drive.

It will probably work fine though.
 
#24
This is the ready to run BTSB Panel Mount thread. There is a BOM on the main GB DIY thread here:

https://www.diyaudio.com/community/...e-bal-to-se-bal-buffer-gb.358142/post-6522803

Correction to above schematic: J1 and J2 (RCA shield) should connect signal ground and not chassis ground.

You can get to it from post 1. Several people have built this and probably can send you a link to their Mouser BOM. I think the problem is, we rarely ever place an order for a single project so there is always miscellaneous stuff mixed in the order. So the BOM is never clean.

Let me know if you need anything else.

Schematic:
btsb-panel-v1-2p-schematic-jpg.919975


BOM:
https://www.diyaudio.com/community/attachments/btsb_panel_bom_v1_2p-zip.919976/
 
#27
Nice, are you using chip quick solder? I need the smaller tip, I think you mention henna needles for the dispenser, and what temp are you setting your hot air gun at. Vunce is setting me up on a Mouser project. You know I didn’t know you had completed ones still available, stupid me.
 
#28
I set hot air pencil at 320C I think. Hot plate gets PCB to 150C. 22 ga blue henna tip.

Yes, ChipQuick paste:

https://a.co/d/hRz4y3k

Although the above video was done without a dispenser tool, I highly recommend a JBC manual dispenser ($50 but worth preventing cramped hands and makes precise paste dots):

https://www.jbctools.com/dpm-a-hand-solder-paste-dispenser-product-1709.html

I just saw this one recently but not sure how well it works - the JBC is really precise and ergonomic:

https://a.co/d/dh55zqp

You will need good tweezers and a good set of binocular magnifiers.

Or if you want instant gratification, order the RTR unit. 🙂
 
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