Group Buy of Key Components Sets
... starting the group buy for the Key Components.
Please check the BOMs of my previous postings to see which components
you still will need to organize from other sources of your choice.
Main Board
KCS MB1:
Costs: 14,89 EUR + Shipping
PCB: Mainboard 50mm x 100mm
U1: IRS2092
Q6, Q7: IRFI4212H-117P
C20, C22: ELNA RJJ 470uF / 63V
C9, C10, C13, C14, C16, C17, C19, C21, C27, C28: 1uF/50V, 1206, X7R
C15, C16: 100pF, 500V, COG
L1: T106-2 + Wire
D3, D7, D8: MBR1100
D4: BAV21
Gain Board:
KCS GB1:
The first 12 Sets will get the PCB for free, because it is
the PCB with the Silk Screen errors.
==> Costs for the first 12Sets 7,62EUR + Shipping.
PCB for free: Dated 17.10.2014 (Version with Silk Screen Errors)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
KCS GB2:
==> Costs: 9,61EUR + Shipping.
PCB for free: Dated 21.11.2014 (Silk Screen corrected, but untested)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
Please post your request in this thread.
Simply say how many of which KCS you want to have.
I will collect your requests until Dec. 12th.
Let's clarify shipping adress, legal/customs and payment (direct bank transfer or pay pal) by PM.
After Dec. 12th I will post a summary of confirmed requests.
Then I will check and if necessary reorder components.
I hope to be able to use X-mas time and early Jan for packaging and ship before mid Jan.
Shipping will be by DHL.
Costs for shipping inside Germany: 4,99EUR
Costs for shipping inside EU: 13,99 EUR
Costs for world wide shipping: 30-50 EUR (ugh..)
... starting the group buy for the Key Components.
Please check the BOMs of my previous postings to see which components
you still will need to organize from other sources of your choice.
Main Board
KCS MB1:
Costs: 14,89 EUR + Shipping
PCB: Mainboard 50mm x 100mm
U1: IRS2092
Q6, Q7: IRFI4212H-117P
C20, C22: ELNA RJJ 470uF / 63V
C9, C10, C13, C14, C16, C17, C19, C21, C27, C28: 1uF/50V, 1206, X7R
C15, C16: 100pF, 500V, COG
L1: T106-2 + Wire
D3, D7, D8: MBR1100
D4: BAV21
Gain Board:
KCS GB1:
The first 12 Sets will get the PCB for free, because it is
the PCB with the Silk Screen errors.
==> Costs for the first 12Sets 7,62EUR + Shipping.
PCB for free: Dated 17.10.2014 (Version with Silk Screen Errors)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
KCS GB2:
==> Costs: 9,61EUR + Shipping.
PCB for free: Dated 21.11.2014 (Silk Screen corrected, but untested)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
Please post your request in this thread.
Simply say how many of which KCS you want to have.
I will collect your requests until Dec. 12th.
Let's clarify shipping adress, legal/customs and payment (direct bank transfer or pay pal) by PM.
After Dec. 12th I will post a summary of confirmed requests.
Then I will check and if necessary reorder components.
I hope to be able to use X-mas time and early Jan for packaging and ship before mid Jan.
Shipping will be by DHL.
Costs for shipping inside Germany: 4,99EUR
Costs for shipping inside EU: 13,99 EUR
Costs for world wide shipping: 30-50 EUR (ugh..)
Hello Choco
You can try this: PCB Prototyping
10 pieces of 10cm by 5cm board with 2 layers with green solder mask costs 9.5 Euro
You can try this: PCB Prototyping
10 pieces of 10cm by 5cm board with 2 layers with green solder mask costs 9.5 Euro
Last edited:
That's even slightly less than where I got my PCBs.
Anyhow, at small volumes in both cases the shipping costs dominate total costs...
But - is reckless fast&cheap really the holy grail?
Many thanks to Twest who noticed a discrepancy between schematic & BOM.
The values of C101 and C102 in the BOM are correct: 4.7uF
Attached the schematic with corrected values.
Main reason for these high values is the fact than as soon as the limiter starts to act the input impedance will drop massively.
0.22uF would then lead to an audible loss of bass, which can be easily avoided by using 4.7uF.
The values of C101 and C102 in the BOM are correct: 4.7uF
Attached the schematic with corrected values.
Main reason for these high values is the fact than as soon as the limiter starts to act the input impedance will drop massively.
0.22uF would then lead to an audible loss of bass, which can be easily avoided by using 4.7uF.
That's even slightly less than where I got my PCBs.
Anyhow, at small volumes in both cases the shipping costs dominate total costs...
But - is reckless fast&cheap really the holy grail?
You can check with ionutzxpo. He ordered from them and he seems very pleased with their short ETA and the small prices.
He can share more detail with everyone.
Hi guys,
I made about 50 pcb total in different orders but only 10X10cm, one order with stencil and i was very impressed by the quality of it (stainless steel with hard aluminum frame).They are very serios when reciving the gerbers from you,if you made some sort of mistakes they immediately contact you over email and let you know that something is wrong with the gerbers.First time when i recived the PCB i was
omg what a quality! they are like pictures, they shine! the layer of soldermask is very thick.
Anyway I work with them now, they are by far the cheapest for DIY PCB production in small amounts.
I made about 50 pcb total in different orders but only 10X10cm, one order with stencil and i was very impressed by the quality of it (stainless steel with hard aluminum frame).They are very serios when reciving the gerbers from you,if you made some sort of mistakes they immediately contact you over email and let you know that something is wrong with the gerbers.First time when i recived the PCB i was
omg what a quality! they are like pictures, they shine! the layer of soldermask is very thick.Anyway I work with them now, they are by far the cheapest for DIY PCB production in small amounts.
Customs Regulations are restricting the group buy
Customs regulations force me to restrict the group buy.
The required declaration data for shipping outside EU is so detailed, that I simply do not have reliable informations for most components.
KCS MB1 & KCS GB1 & KCS GB2 can only be send inside EU.
Outside EU I can offer only the PCB of the MainBoard.
In most cases the PCB of the main board alone will be unattractive,
especially because of shipping costs.
However I did not disclose the gerbers of the main board,
so this opens at least the option to get the PCB at all.
Please check the BOMs of my previous postings to see which components
you still will need to organize from other sources of your choice.
Main Board
PCB of main board only (like used in KCS MB1):
Costs: 2,43 EUR + Shipping
KCS MB1 (EU only):
Costs: 14,89 EUR + Shipping
PCB: Mainboard 50mm x 100mm
U1: IRS2092
Q6, Q7: IRFI4212H-117P
C20, C22: ELNA RJJ 470uF / 63V
C9, C10, C13, C14, C16, C17, C19, C21, C27, C28: 1uF/50V, 1206, X7R
C15, C16: 100pF, 500V, COG
L1: T106-2 + Wire
D3, D7, D8: MBR1100
D4: BAV21
Gain Board:
KCS GB1 (EU only):
The first 12 Sets will get the PCB for free, because it is
the PCB with the Silk Screen errors.
==> Costs for the first 12Sets 7,62EUR + Shipping.
PCB for free: Dated 17.10.2014 (Version with Silk Screen Errors)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
KCS GB2 (EU only):
==> Costs: 9,61EUR + Shipping.
PCB: Dated 21.11.2014 (Silk Screen corrected, but untested)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
Please post your request in this thread.
Simply say how many of which KCS you want to have.
I will collect your requests until Dec. 12th.
Let's clarify shipping adress, legal/customs and payment (direct bank transfer or pay pal) by PM.
After Dec. 12th I will post a summary of confirmed requests.
Then I will check and if necessary reorder components.
I hope to be able to use X-mas time and early Jan for packaging and ship before mid Jan.
Shipping will be by DHL.
Costs for shipping inside Germany: 4,99EUR
Costs for shipping inside EU: 13,99 EUR
Costs for world wide shipping: 30-50 EUR
Customs regulations force me to restrict the group buy.
The required declaration data for shipping outside EU is so detailed, that I simply do not have reliable informations for most components.
KCS MB1 & KCS GB1 & KCS GB2 can only be send inside EU.
Outside EU I can offer only the PCB of the MainBoard.
In most cases the PCB of the main board alone will be unattractive,
especially because of shipping costs.
However I did not disclose the gerbers of the main board,
so this opens at least the option to get the PCB at all.
Please check the BOMs of my previous postings to see which components
you still will need to organize from other sources of your choice.
Main Board
PCB of main board only (like used in KCS MB1):
Costs: 2,43 EUR + Shipping
KCS MB1 (EU only):
Costs: 14,89 EUR + Shipping
PCB: Mainboard 50mm x 100mm
U1: IRS2092
Q6, Q7: IRFI4212H-117P
C20, C22: ELNA RJJ 470uF / 63V
C9, C10, C13, C14, C16, C17, C19, C21, C27, C28: 1uF/50V, 1206, X7R
C15, C16: 100pF, 500V, COG
L1: T106-2 + Wire
D3, D7, D8: MBR1100
D4: BAV21
Gain Board:
KCS GB1 (EU only):
The first 12 Sets will get the PCB for free, because it is
the PCB with the Silk Screen errors.
==> Costs for the first 12Sets 7,62EUR + Shipping.
PCB for free: Dated 17.10.2014 (Version with Silk Screen Errors)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
KCS GB2 (EU only):
==> Costs: 9,61EUR + Shipping.
PCB: Dated 21.11.2014 (Silk Screen corrected, but untested)
C101, C102: 4.7u Film/Foil, 63V 7x7RM5
C110: 4u7/16V, Leakage < 0.5uA, D6RM2.5
Q1: 2SC5171, TO-220
Q2: 2SA1930, TO-220
R114: 1N4148WS, SM0805
U101: NSL-32
U102: OPA2134, DIP-8
U103: TL074, SOIC-14
Please post your request in this thread.
Simply say how many of which KCS you want to have.
I will collect your requests until Dec. 12th.
Let's clarify shipping adress, legal/customs and payment (direct bank transfer or pay pal) by PM.
After Dec. 12th I will post a summary of confirmed requests.
Then I will check and if necessary reorder components.
I hope to be able to use X-mas time and early Jan for packaging and ship before mid Jan.
Shipping will be by DHL.
Costs for shipping inside Germany: 4,99EUR
Costs for shipping inside EU: 13,99 EUR
Costs for world wide shipping: 30-50 EUR
LED Tweak
If your signal LED of the Limiter appears not bright enough for your taste,
here a possible mod without increasing complexity.
First make sure that your LED is a type with Vf = 1.6V...1.7V.
Increasing the value of R123, will lift the current in the signal LED vs the current in the NSL-32.
No matter which value you choose for R123 the dynamic OP amp control of the NSL-32 will remain proper.
Only disadvantage of an increased R123 is that the max factor of input voltage back regulation will be reduced.
The original value of 470R enables a factor of twelve.
When you increase R123 up to 6k8 then this factor will drop to four.
IMHO a backregulation of factor four (12db) is more or less what a limiter should be capable at least. So the max advisable value for R123 is 6k8.
==> Feel free to adjust R123 between 470R ...6k8 to get the LED brightness you wish.
If your signal LED of the Limiter appears not bright enough for your taste,
here a possible mod without increasing complexity.
First make sure that your LED is a type with Vf = 1.6V...1.7V.
Increasing the value of R123, will lift the current in the signal LED vs the current in the NSL-32.
No matter which value you choose for R123 the dynamic OP amp control of the NSL-32 will remain proper.
Only disadvantage of an increased R123 is that the max factor of input voltage back regulation will be reduced.
The original value of 470R enables a factor of twelve.
When you increase R123 up to 6k8 then this factor will drop to four.
IMHO a backregulation of factor four (12db) is more or less what a limiter should be capable at least. So the max advisable value for R123 is 6k8.
==> Feel free to adjust R123 between 470R ...6k8 to get the LED brightness you wish.
Correct orientation of the TL074
The marking of SOIC14 sometimes is less obvious than the marking of DIL.
The TL074 from STM, which I am using has marked the side of pin1...pin7 by an inclined surface of the plastic.
Attached two pictures, which show the right orientation of the TL074.
The marking of SOIC14 sometimes is less obvious than the marking of DIL.
The TL074 from STM, which I am using has marked the side of pin1...pin7 by an inclined surface of the plastic.
Attached two pictures, which show the right orientation of the TL074.
