PeeCeeBee Preamplifier GB

[gary s]

Thank again shaan for the setup guide, will be helpful to a lot of the GB builders.

 

[didiet78]

Thanks for the setuo guide.

 

[ecclesand]

Invoice paid. Sorry for the late payment Shaan...I don't check the site as much as I used to.

 

[shaan]

Hi Douglas.

No problem. Payment received. Your board is booked.

 

[ckwong99]

Hi Shaan,
I want to direct +/-16VDC battery supply at TP1&2, to drive the preamp board. I plan to deploy 18650 (each 2800mA) x 4 x 2, can you estimate how long I can play with this preamp by this battery system？

 

[zei]

Anyone made a mouser bom list for this?

Best regards
JZ

 

[didiet78]

Hi Shaan,
I want to direct +/-16VDC battery supply at TP1&2, to drive the preamp board. I plan to deploy 18650 (each 2800mA) x 4 x 2, can you estimate how long I can play with this preamp by this battery system？

I estimate 30+ hours if you uses series regulator not ehunt reg. And set cut off voltage around 3v per battery.

 

[ckwong99]

Thx Didiet78 )

 

[iamwhoiam]

Anyone made a mouser bom list for this?

Best regards
JZ

+1

 

[gary s]

There is a normal BOM in shaan's post #1.

 

[shaan]

Update: Preamp boards shipped from fab. Expecting them at hand by Monday.

 

[NealJ]

Excellent! Still don't know whether to build this as a headphone amp or as the preamp to my V4....decisions, decisions.

 

[shaan]

Hi Neal.

You can build as both. Bias it for headphone application and just connect a pair 470uF off board from TP4 and TP6 to the headphone socket (install a pair 10kohm to ground from the negative pins of the electros). Return the shield directly to GND via a thick wire. You may want to remove the headphone jack during using as preamp as the low load impedance will bring output voltage down a bit due to high current draw from preamp.

 

[NealJ]

Thanks Shaan, that sounds ideal.

 

[vj_audio]

@shaan where can parts be bought online in India except element14/Rsdeliver these are too costly.

 

[shaan]

Hi vj_audio.

The local market of course! But not all parts can be found there.

 

[chakaandgeorgie]

please count me in for PCB.
Ashley

 

[CitizenKane]

Dual function ... Perfect ...

Hi Neal.

You can build as both. Bias it for headphone application and just connect a pair 470uF off board from TP4 and TP6 to the headphone socket (install a pair 10kohm to ground from the negative pins of the electros). Return the shield directly to GND via a thick wire. You may want to remove the headphone jack during using as preamp as the low load impedance will bring output voltage down a bit due to high current draw from preamp.

Hi Shaan,

- the shield from what? May be a stupid question ...
- the same types / Voltage for the Caps like C27, C28 ?

Thanks a lot

Joe

 

[shaan]

Hi Joachim.

- Shield of the headphone socket. Not a stupid question at all! The shield should be isolated from chassis and routed to GND on the Preamp PCB with its own thick wire.
- 25V rated as suggested in the BOM. In fact the 10uF for preamp can be 63V rated without any problem.

 

[shaan]

Update:

The good stuff has arrived! I have already assembled one of them and it is working perfectly! We're good to go!

Regarding available shipping options to different countries, I have made a list of all the countries that the boards are to be shipped (along with V4H and PSU), and will take it to the PO today to check what options among speedpost, air parcel and registered post have now become available for each country. Our extremely "smart" Govt. postal website has no update of any sort so far on this, so I will spend some quality time with the officer today and get the list updated. Will share it in the evening.

Thanks everyone for your patience.