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PeeCeeBee V4 GB!
PeeCeeBee V4 GB!
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Old 25th April 2017, 07:30 PM   #1
shaan is offline shaan  India
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Default PeeCeeBee V4 GB!

Hello guys!

A fresh new PeeCeeBee is here, the V4! In this thread group-buys for the printed circuit boards are arranged.

It's a Lateral MOSFET based Class-AB amplifier with symmetrical "current feedback", evolved from from the diverse PeeCeeBee series, and now with excellent sonics coupled with excellent looks.

The new design is electrically and sonically a step forward from the "stubbornly" simple but very good sounding designs released in the original PeeCeeBee thread. I say a step forward partly because it incorporates some extra well-known techniques to handle some of the problem areas in the old designs and allows a quicker and safer mode of set-up and operation, but mostly because while doing so it didn't become a fatigue-inducing clinical sounding amplifier. The layout is designed by myself and the amplifier is very stable, both thermally and electrically. The amplifier has similar sonic signature to the previous peeceebees in the mid and high frequency band, but the low-frequency performance has been substantially improved so that it can be used as a full-range amplifier with effortless bass as well as beautiful midrange and highs.

It uses a simple but effective diode-clamp based soft-clipping so that occasional overloads don't bother listening enjoyment. The two jumpers, when open, remove the chance of overloading Q9/Q10 while setting-up. The constant current sources keep the input/VAS bias much less affected by power supply variation during loud playback and/or mains fluctuation.

The following two screenshots show the design:

Click the image to open in full size.
Click the image to open in full size.

This is how the PCB looks in real world:

A fully assembled channel:


Some specs (measured with generic components/passives and basic unregulated linear PSU):
Maximum Power - 50WRMS/90WRMS into 8R/4R load with +/-35V PSU
Maximum allowed PSU voltage for 4R operation - +/-35V (with default clamp diodes and BD BJTs for Q9/Q10) and +/-42V (with higher voltage rated clamp diodes and MJE BJTs for Q9/Q10)
Frequency response(simulated) - ~2Hz to ~800KHz (-3dB)
AC gain - 23 (27dB)
DC gain - Unity
Input level for 50WRMS into 8R - 1VRMS
THD 100Hz 10W - 0.0005%, 1KHz 10W - 0.001%, 10KHz 10W - 0.01%
Slew Rate - 100V/uS
SNR - >100dB
Offset variation - +/-10mV

Screenshot of 1KHz THD spectrum (10W into 8R resistive load, 0.002% source THD):
Click the image to open in full size.
Screenshot of 1KHz + 5.5KHz IMD spectrum (1.7W into 8R load):
Click the image to open in full size.

__________________________________________

Group Buy Information:

The PCBs are 92mmx64mm 2-Layer and I plan to batch-print 50, 75 or 100 PCBs depending on interest and how many people join in the GB list. The boards are made with 2.4mm FR4, 60micron copper, HASL finish, white silkscreen and black solder mask, as shown in the above pictures.

> The PCBs cost US$10 a piece.
> Shipping charge is as per SpeedPost norms for India and other countries + US$1.5 PayPal charge (only for international buyers) + $2 packaging and processing charge.
> After the GB list is full, each user will be contacted and sent the first invoice for a confirmation charge of US$5 per board for the group buy, and the rest (including remaining PCB price, shipping charge, packing and processing charge and PayPal charge) to be paid before shipping the boards, for which the second invoice will be sent. This is simply because I don't have all of the necessary budget to get all the boards printed in a batch.
> International payments are accepted through PayPal and payments from within India are accepted through bank account transfer/deposit, NEFT etc.
> Delay between placing the batch order to PCB plant and delivery of the boards to me will be 18-20 days.




SpeedPost covers 100 countries worldwide so I can use it for the listed countries for quick delivery of consignments. The attached pdf shows the list of the countries covered by SpeedPost (see update below).

Update: For shipping to countries not listed in the Speedpost list, registered air mail will be used. Time taken for delivery is normally double or higher than Speedpost but now the boards can be shipped to any country.




Please Note:
The default price per board for a 50 PCB batch-print is $10. If more people join the GB, more boards will be ordered and price per board will decrease accordingly:

75 boards printed: $9 per PCB
100 boards printed: $8 per PCB




GB1 (April 26 2017)
--------------------------------
Update: Pending members and anyone wishing to join, Please notice:
PM/invoices will be sent up-to 5th May.
Last day of confirming order is 7th May.
PCBs will be ordered on 8th May.

Update(May 9 2017): Total 120 boards ordered. There are still 10 spare PCBs so join in if interested in a couple.
Update(May 11 2017): GB list full. No new entries are being taken until June 1 2017.
GB1 Ended.

--------------------------------

GB2 (June 15 2017)
-------------------------------
Second group buy has started.
Update (July 5 2017): Second GB will be closed on July 15 2017. Join in if interested!
Update (July 26 2017): PCB Batch order placed.
GB2 Ended.

-------------------------------

GB3 (Sept 12 2017)
-------------------------------
Third group buy is now open for entry. Join in if interested!
-------------------------------



Important Links:

Latest BOM for PeeCeeBee V4 >Here<
Setup Guide And Component Indication >Here< (Follow this to populate and start the PCBs)
Heat Sink Drill Template >Here<

Notice: The old schematic had an error and has been removed. The schematic you see attached below is correct.
Please note that only the schematic alone had this problem, the PCBs are fully error-free.


Thanks.
shaan
Attached Images
File Type: png peeceebee-v4.png (41.5 KB, 602 views)
Attached Files
File Type: pdf Speedpost Country List.rtf.pdf (26.1 KB, 356 views)

Last edited by shaan; 27th September 2017 at 04:32 AM.
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Old 25th April 2017, 07:56 PM   #2
meanman1964 is offline meanman1964  Belgium
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Do we sign in here ?
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Old 25th April 2017, 08:14 PM   #3
shaan is offline shaan  India
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You're welcome to add an entry like the following if you are interested.

username - x PCBs

Replace "username" with your user ID and "x" with the number of boards you want.
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Old 25th April 2017, 08:20 PM   #4
dersucher is online now dersucher  Germany
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Join Date: Mar 2007
Many Thanks for sharing that nice design!
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Old 25th April 2017, 08:22 PM   #5
brunogiovs is offline brunogiovs  Canada
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Join Date: Sep 2014
brunogiovs - 2 PCBs
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Old 25th April 2017, 08:29 PM   #6
shaan is offline shaan  India
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Quote:
Originally Posted by dersucher View Post
Many Thanks for sharing that nice design!
My pleasure mate.

Quote:
Originally Posted by brunogiovs View Post
brunogiovs - 2 PCBs
Thanks for starting it up.
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Old 25th April 2017, 08:30 PM   #7
jacques antoine is offline jacques antoine  France
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PeeCeeBee V4 GB!
Jacques antoine 2 pcbs
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Old 25th April 2017, 08:35 PM   #8
cats squirrel is offline cats squirrel  United Kingdom
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Join Date: Feb 2011
Location: Devon, UK
cats squirrel x4 pcbs
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Old 25th April 2017, 09:21 PM   #9
gusto142 is offline gusto142  Netherlands
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gusto142 - 2 pcb's
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Old 25th April 2017, 09:26 PM   #10
btesize is offline btesize  Turkey
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Join Date: Dec 2009
Location: Istanbul
Hello Shaan I need 4 pcb's
How can i pay
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