Interesting, especially the PSRR graphs. Did you try injecting any power supply noise frequency above the mains ripple? I would be curious to know if the PSRR changes with higher frequency noise.To LC and others, may-be this can interest-you:
http://www.esperado.fr/temp/VSSA/cfa-vs-vfa.html
Distortion, bandwidth, slewrate, noise, PSRR etc.
I am very happy to be on the list. Looking forward to using these. Please let me know where to send the funds, etc.
Thank you LC for your efforts.
Thank you LC for your efforts.
BYRTT 8 PCB set
CaféNoir 6 PCB set
ColinAlex 8 PCB set
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400
electromf 4 PCB set
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
tritosine 4pcb (2 pairs)
Bobo le Chat 2 pcb set
AP2 2pcb set+2pcb empity (i need this also)
Meganinja 2 set ( stereo )
mikvous 2 pcb set
Rick G 2 PCB set
kindhornman 2 boards
ravid 2 pcb set 100
gnat 2 pcb set
potepuh 2 pcb set
metallicus69 4 pcb set
Ranchu32 2 pcb set
woofertester 4 pcb set
__________________________________________________________
114 VSSA PCB set
Optional GB list if any from above will cancel the order:
siberia 1 pcb (if possible) - not possible, please send broken VSSA to repair
edbk 4 pcb set
Raj1 2 pcb set (or 6 if available)
analog_sa 2pcb set (will even take 1 if none are left)
mravlca 2pcb set
Cuda 2pcb set
Guys please check GB list and if any from above the line list would like to cancel the order please say it now, so the guys from optional GB list can be supplied.
Regards L.C.
Qoute: 2282.
Here is attached files for circuit schematic v1.3 and v1.4 to use in TINA TI v9.xx.
Program is free get it at Texas Instruments website.
IMPORTANT: The exentension (*.txt) should be renamed to (*.tsc), else i could not attach because of extension limit at this site.
Ricky
Here is attached files for circuit schematic v1.3 and v1.4 to use in TINA TI v9.xx.
Program is free get it at Texas Instruments website.
IMPORTANT: The exentension (*.txt) should be renamed to (*.tsc), else i could not attach because of extension limit at this site.
Ricky
Attachments
@LazyCat: I'm about to order the capacitors for your board. Would there be any benefit if I increase the capacitance of the 1000uF and 2200uF Caps, provided that I could find the capacitor with the same space/lead size?
In my case, getting Nichicon FG is very non-economical (for example Mouser charge $30 just for the shipping cost) and I'm considering to use Panasonic FM instead from Farnell.
-David
In my case, getting Nichicon FG is very non-economical (for example Mouser charge $30 just for the shipping cost) and I'm considering to use Panasonic FM instead from Farnell.
-David
Qoute: 2282.
Here is attached files for circuit schematic v1.3 and v1.4 to use in TINA TI v9.xx.
Program is free get it at Texas Instruments website.
IMPORTANT: The exentension (*.txt) should be renamed to (*.tsc), else i could not attach because of extension limit at this site.
Ricky
Are these the single ended versions?
VSSA PCB set - 2nd GB Final List
GB Final List:
BYRTT 8 PCB set (already payed - payment received)
CaféNoir 6 PCB set (already payed - payment received)
ColinAlex 8 PCB set (already payed - payment received)
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400 (already payed - payment received)
electromf 4 PCB set (already payed - payment received)
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
tritosine 4pcb (2 pairs)
Bobo le Chat 2 pcb set
AP2 2pcb set+2pcb empity (i need this also)
Meganinja 2 set ( stereo )
mikvous 2 pcb set
Rick G 2 PCB set
kindhornman 2 boards
ravid 2 pcb set
gnat 2 pcb set
potepuh 2 pcb set
metallicus69 4 pcb set
Ranchu32 2 pcb set
woofertester 4 pcb set
______________________________________________
114 VSSA PCB set
Hi GB members.
Now is the time to send your exact address information to:
esl@siol.net
Please prepare your address information in most exact form, like this:
1. line: Your diyAudio Forum Name (very very important)
2. line: Company Name (if not any please skip this line)
3. line: First Name Second Name (family name)
4. line: Street Name Street Number
5. line: Street or District Name (if not any please skip this line)
6. line: City Code Number (postal number) City Name
7. line: Province or State Name (if not any please skip this line)
8. line: Country Name
9. line: e-mail address (very very important)
I will prepare the Proforma Invoices for all of you and send them to your e-mail addresses. There will be all informations necessary to confirm and pay your orders.
Please do not send any info to diyAudio PM, only to esl@siol.net. Thanks.
If I will not receive the info from some GB member, I will imediately inform the first one from the Optional GB list to step in instead.
Regards to all L.C.
GB Final List:
BYRTT 8 PCB set (already payed - payment received)
CaféNoir 6 PCB set (already payed - payment received)
ColinAlex 8 PCB set (already payed - payment received)
DavorXXL 6 PCB set
DuffyDawg 4 PCB set + 4 SMPS400 (already payed - payment received)
electromf 4 PCB set (already payed - payment received)
badrisuper 2 PCB set
volavola 2 PCB set
JethroTull 2 PCB set
kp93300 2 PCB set
momomo67890 4 pcb set
ua3grn 6pcb set
mj777 2pcb set
mkusan 2pcb set
Odysseas 4pcb (2 pairs)
hcbonfim 2pcb set
Albrerta 2pcb set
dw1narso 2 pcb set (1 stereo)
supernet 2 pcb set
milandks 4pcb set
tjencks 2pcb set
quanghao: 2pcb set
audionootje: 4pcb set (2x stereo)
tritosine 4pcb (2 pairs)
Bobo le Chat 2 pcb set
AP2 2pcb set+2pcb empity (i need this also)
Meganinja 2 set ( stereo )
mikvous 2 pcb set
Rick G 2 PCB set
kindhornman 2 boards
ravid 2 pcb set
gnat 2 pcb set
potepuh 2 pcb set
metallicus69 4 pcb set
Ranchu32 2 pcb set
woofertester 4 pcb set
______________________________________________
114 VSSA PCB set
Hi GB members.
Now is the time to send your exact address information to:
esl@siol.net
Please prepare your address information in most exact form, like this:
1. line: Your diyAudio Forum Name (very very important)
2. line: Company Name (if not any please skip this line)
3. line: First Name Second Name (family name)
4. line: Street Name Street Number
5. line: Street or District Name (if not any please skip this line)
6. line: City Code Number (postal number) City Name
7. line: Province or State Name (if not any please skip this line)
8. line: Country Name
9. line: e-mail address (very very important)
I will prepare the Proforma Invoices for all of you and send them to your e-mail addresses. There will be all informations necessary to confirm and pay your orders.
Please do not send any info to diyAudio PM, only to esl@siol.net. Thanks.
If I will not receive the info from some GB member, I will imediately inform the first one from the Optional GB list to step in instead.
Regards to all L.C.
Last edited:
To LC and others, may-be this can interest-you:
http://www.esperado.fr/temp/VSSA/cfa-vs-vfa.html
Distortion, bandwidth, slewrate, noise, PSRR etc.
Esperado, you are a great friend, happy to have you around here, my admiration to you.
This is a great contribution to this thread which will help many of us to understand the topic even deeply by your step by step presentation. Many thanks for your will and time spent.
To LC and others, may-be this can interest-you:
http://www.esperado.fr/temp/VSSA/cfa-vs-vfa.html
Distortion, bandwidth, slewrate, noise, PSRR etc.
Hi Christophe and Andrej i have run simulation with Christophes circuit schematics for CFB and VFB which i attach as images (Thanks for the link Christophe).Esperado, you are a great friend, happy to have you around here, my admiration to you.
This is a great contribution to this thread which will help many of us to understand the topic even deeply by your step by step presentation. Many thanks for your will and time spent.
When i remove "C4" from the VFB version it outperforms the other two except distortion.
Bear over with me i am hobbyist so only few of your knowlegde, but will the setup without "C4" be possible to realworld ?.
The models used for VAS and Output devices are not real manufacturer models but generic types from TINA program, but precision should not matter because the three simulations are compareable.
So Andrej should we buy a pair of BC550/560 and few resistors for tuneup ?
Regards Ricky
Attachments
Hum...Did-you measured slew rate ? I doubt there will be a big change and that's the important point. I mean, that makes all the difference in listening experience, witch make some prefer current feedback amplifiers.(on my point of view)When i remove "C4" from the VFB version it outperforms the other two except distortion.
will the setup without "C4" be possible to real world ?.
We are not fighting about bandwidth witch is anyway killed by the input low pass filter. ;-).
By the way, this comparison is on an educational point of view, to make discover some things about current feedback, and kill some urban legend about more noise and distortion, as an example.
Without the cap, i doubt you can have a decent DC offset. And the cap is fair in this comparison, as it correspond to the C4 C6 of the VSSA (same response curve in low frequency).
I have to apologize, i made a little error with the input stage current: i did not took in consideration the currents used by the feedback path in CFA. I had spend some more hours to tune the VFA to perfectly match the CFA, both in gain and current in transistors of all stages. Guess what ?
The distortion of the VFA worsen. 0.001059 at 1000Hz. (it was 0.000978)
Oh Lord, don't buy me two extra transistors
Last edited:
I do not think that Lazy Cat wants us to use the pm on this site to communicate. He did list his email address for communication. It is as follows:
esl@siol.net
esl@siol.net
FETs for input current sources
Can someone point me to SPICE models for the FETs used in the input current sources. I think they are 2n5462.
I saw LC had a procedure to adjust these too but I've lost it.
Please excuse me but I'm slowly reading through the thread but am only at about #100
Can someone point me to SPICE models for the FETs used in the input current sources. I think they are 2n5462.
I saw LC had a procedure to adjust these too but I've lost it.
Please excuse me but I'm slowly reading through the thread but am only at about #100
I think they are 2n5462.
BF545B
Why on earth would you need spice models? They are clearly set to 2.4mA...
*PHILIPS SEMICONDUCTORS Version: 1.0
*Filename: BF245B.PRM Date: Oct 1992
*
.MODEL BF245B NJF
+ VTO = -2.3085E+000
+ BETA = 1.09045E-003
+ LAMBDA = 2.31754E-002
+ RD = 7.77648E+000
+ RS = 7.77648E+000
+ IS = 2.59121E-016
+ CGS = 2.00000E-012
+ CGD = 2.20000E-012
+ PB = 9.91494E-001
+ FC = 5.00000E-001
*Parameter with default value: FC
*Filename: BF245B.PRM Date: Oct 1992
*
.MODEL BF245B NJF
+ VTO = -2.3085E+000
+ BETA = 1.09045E-003
+ LAMBDA = 2.31754E-002
+ RD = 7.77648E+000
+ RS = 7.77648E+000
+ IS = 2.59121E-016
+ CGS = 2.00000E-012
+ CGD = 2.20000E-012
+ PB = 9.91494E-001
+ FC = 5.00000E-001
*Parameter with default value: FC
HI
I am about to order an smps from Connexelectroinic for use with the group buy pcb.
Is this suitable ? the SMPS800RE
Connexelectronic
Any other recommendations ?
Is the SMPS300RE adequate ?
thanks
kp93300
I am about to order an smps from Connexelectroinic for use with the group buy pcb.
Is this suitable ? the SMPS800RE
Connexelectronic
Any other recommendations ?
Is the SMPS300RE adequate ?
thanks
kp93300
Last edited:
Salas says bf245. Both of these are 30V Vds max so would be iffy for a 50W 8R version.BF545B
Why on earth would you need spice models? They are clearly set to 2.4mA...
2n5462 is 40V Vds max so probably OK for 50W 8R.
Anyone know where the adjustment procedure is? It looks like you'd have to tweak both sides for IPS current as well as DC offset.
________________
Salas, where do you get these Philips SPICE models?
Last edited:
- Home
- Vendor's Bazaar
- VSSA Lateral MosFet Amplifier