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PeeCeeBee V4 GB!

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#704
ecclesand said:
Love my V4 Rev 1 amp! Any news on the upgrade to existing Rev 1 owners?
Click to expand...

Here we go: (one channel shown)

Step 1: Get 2x47pF and 2x220pF 500V ceramic capacitors and cut their legs like shown in the pic.

FCDVJKiMOO9zQnBfZCVPsy-S40aQtXON7bkVq19IyLB-E_eH7yDQv3fm5R3-fXfB69rPRy2IUxP5N5QA0TU=w1024

Step 2: Bend one leg of each capacitor at its knee to 90deg.

fGqoVgxMDwfiGtZc3zmvKrg375b6LOS2gtENnbv8dFfaudYjbtVSq_jV-pj0y1vGEovyL0-evbalEyoiGeo=w1024

Step 3: Remove C9 and C10 from V4 Rev1 PCB.

UM1xDKBkYi3-m0tj66U8YZR1cSwtqiAFAuVhRZFMeSt3EtFekLxgMyMNDkknbJ7KgcthdtUk3bSlsw92nVs=w1024

Step 4: Solder the bent legs of the four capacitors as shown. 47pF facing the input side and 220pF facing output side.

n-FJJneAfQFeUqnIDuTHXqF2BgEMJkIT7jIO-4yDHfN1s1iNLuTFFIB83A5f8XmpVa1FPmLhVv9YOhtozNI=w1024

Step 5: Bend the floating straight leg of the 47pF capacitors and solder it to the floating leg of 220pF.

2ZYQxW-LZwR6MGPcAuQc1qQn0cMiFV46g8HLUghzKA_MEnPdj4G2_r7ZfxpSpFcp_Vo2kkbk9daEFe42w0Y=w1024

Step 6: Get a pair of 2K2 1/4W resistors. Cut one leg at 5mm from its body. Solder that leg to one of the pads for 47R resistors close to the output terminal. Solder the other leg of each resistor to the floating solder joint of the 47pF and 220pF capacitors on its respective side. Cut off the excess length of legs.

yDvYaYJPpVzLYWJO2Fnj-Ne9G5QCRcPu3bhg1xLh1nsGcZuhkVJHwnqjSo7G2PR4qekeoblX5HvM_xYNmqw=w1024

Done. Enjoy the music. 🙂
 
#705
The above modification results in the following changes in 1KHz and 10KHz harmonic spectrum. Power 45W, load 5R, PSU 35V, MOSFET bias 100mA.

1KHz without mod (Rev1):

59CkQ-48jRKLTsMQBFAMyDY1KR7Bgr6feQB6NHhe1Lt0j2jR_hiegiIFDfUmjV_4WvDvgrjczGOH8Z3yyFM=w1024

1KHz with mod (Rev2):

lkpa79DvdBXcpV2rX-czEslZah2A9LduC179R7oYsMRR0_ArAz2HkhFXHYCuVzdGC-12jzREsp3jOHz2Jjo=w1024

10KHz without mod (Rev1):

dpsgDPXLK56x_Mq1ElPMSqzOlAi8dFjJ9VD3uBlbdL6VQ2K-fB83ZpEkAXobvBnxZZ1M9Dau5t6HiN1vNc8=w1024

10KHz with mod (Rev2):

AnogOV3pAoHfFc08MpCp9UF1Q3CZQPbamqnkctZ8uBs8NMwdp1qJg502px2PRdPFLkJpXQ_zsAJ735Mwfhs=w1024


PeeCeeBee V4 Rev2 layout looks like this.

EComvz5I2VlLdQsy8fbMlzGrSGsMy46eHAh73BL38dbgfOCZRDcnap-pWrK4-r6-q5PdoILgpgiT8mdzj5g=w800

C15, C16, R31, R32 added. Due to space constraint R31 and R32 sits in vertical position.
edit: mounting holes for Q9 to Q12 has been re-positioned. Now the VAS has a little more leg space and ECX devices will be easier to mount.
 
Last edited:
#711
shaan said:
The above modification results in the following changes in 1KHz and 10KHz harmonic spectrum. Power 45W, load 5R, PSU 35V, MOSFET bias 100mA.
- - - - - -
C15, C16, R31, R32 added. Due to space constraint R31 and R32 sits in vertical position.
edit: mounting holes for Q9 to Q12 has been re-positioned. Now the VAS has a little more leg space and ECX devices will be easier to mount.
Click to expand...

Dear Shaan,
kindly post the updated schematic also !
--gannaji
 
#714
GB4 update:

craydive - 6 PCBs + 12 MOSFETs - PAID
Surfatwork - 2 PCBs - PAID
NealJ - 2 PCBs + 4 MOSFETS - PAID
helfred - 2 PCBs - PAID
keesraats - 2 PCBs - PAID
Assesears - 2 PCBs + 4 MOSFETs - PAID
hajj - 2 PCBs + 4 MOSFETs - PAID
phildas - 2 PCBs + 4 MOSFETs - Invoice sent
sasha70 - 2 PCBs + 4 MOSFETs - Invoice sent
CitizenKane - 6 PCBs - Invoice sent
Amitkg - 2 PCBs + 4 MOSFETs - Invoice sent
thekingstallion - 2 PCBs + 4 MOSFETs - Invoice sent
 
#717
GB4 update:

craydive - 6 PCBs + 12 MOSFETs - PAID
Surfatwork - 2 PCBs - PAID
NealJ - 2 PCBs + 4 MOSFETS - PAID
helfred - 2 PCBs - PAID
keesraats - 2 PCBs - PAID
Assesears - 2 PCBs + 4 MOSFETs - PAID
hajj - 2 PCBs + 4 MOSFETs - PAID
sasha70 - 2 PCBs + 4 MOSFETs - PAID
CitizenKane - 6 PCBs - PAID
phildas - 2 PCBs + 4 MOSFETs - Invoice sent
Amitkg - 2 PCBs + 4 MOSFETs - Invoice sent
thekingstallion - 2 PCBs + 4 MOSFETs - Invoice sent
 
#718
GB4 update:

craydive - 6 PCBs + 12 MOSFETs - PAID
Surfatwork - 2 PCBs - PAID
NealJ - 2 PCBs + 4 MOSFETS - PAID
helfred - 2 PCBs - PAID
keesraats - 2 PCBs - PAID
Assesears - 2 PCBs + 4 MOSFETs - PAID
hajj - 2 PCBs + 4 MOSFETs - PAID
sasha70 - 2 PCBs + 4 MOSFETs - PAID
CitizenKane - 6 PCBs - PAID
phildas - 2 PCBs - PAID
Amitkg - 2 PCBs + 4 MOSFETs - PAID
thekingstallion - 2 PCBs + 4 MOSFETs - PAID
asuslover - 2 PCBs - PAID
 
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