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Old 30th September 2012, 09:28 AM   #341
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Gentlemen: as I told you, I will close the "Shunt-Transformer" group-buy tomorrow early morning and will order from BADEL then.
Find attached the current order list.

Two of you have payed already, and I have accepted their payments (my risk?, their risk?).
But: please wait with your payments, until I can give you the exact price (on Monday or Tuesday).

I have also been asked to quote a price for a transformer with the following sepcifications:

115 - 115 VAC / 4 x 25 VAC / 500W transformer, magnetically shielded, encapsulated, ..., with any option that you like,
to be used for both 117VAC and 220VAC primary voltage, suitable to drive both backend-PSUs of Mihai's FC-100.

The advantage: you do only need 1(!) transformer for the FC-100, and you will have "channel - independent - power" as well.

I will tell you the result of my request tomorrow / on Tuesday.

Best regards - Rudi_Ratlos
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Old 30th September 2012, 09:49 AM   #342
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@JethroTull: I updated my order list.

Best regards - Rudi_Ratlos
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Old 2nd October 2012, 07:45 AM   #343
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Default PAYPAL Time for Shunt Transformers

Gentlemen, I am able to offer you the FC-100 Shunt-transformers:

Primary: 115 + 115 Vac (suitable for 110, 115, 120, 220, 230 & 240 Vac primaries)
Secondary: 4 x 34 Vac / 20VA
Option: Magnetic Shielding

for 20€ per piece.
The lead-time is 3 weeks.

Find attached the resulting EXCEL sheet.
You can PAYPAL me now. My PAYPAL-ID is: RRozek@t-online.de

@Those, who ordered FC-100 PCBs and components as well:
I would like and include the transformers in your FC-100 letters (I will use a small parcel instead).
The shipping costs are the same for both alternatives (separate FC-100 letter / separate transformer letter vs. small parcel).
The parcel will be sent to you as "registered mail".

Best regards - Rudi_Ratlos

P.S. I will now go on matching the PNP - NJL transistors.
I have already matched the NPN types.
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Last edited by Rudi_Ratlos; 2nd October 2012 at 07:52 AM.
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Old 2nd October 2012, 01:39 PM   #344
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Default PAYPAL Time for Shunt Transformers

Gentlemen, thank you for your PAYPAL-transfers.

Best regards - Rudi_Ratlos
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Old 2nd October 2012, 05:30 PM   #345
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Gentlemen,

find attached the coloration of the Shunt-Transformers - windings and the current EXCEL sheet.

Best regards - Rudi_Ratlos
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Old 2nd October 2012, 06:08 PM   #346
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Payment sent

Thanks
Do
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Old 4th October 2012, 01:27 AM   #347
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Default Parts Order

I got in late for the group buy but Rudi kindly helped out and I’m on the list for PCB’s, but not for the majority of “hard to get” parts.
For the transistors, I’m about to place an order for the BOM with Reichelt and Mouser but am not sure what quantity’s to order to ensure I get a good chance of correct matching.

From the Rudi’s PDF builder’s manual it gives the following transistors (below) that require matching as close as possible. Could someone please help and estimate the number of individual transistors I should order to have a good chance of matching for the relevant pairs (per PCB).
If this info is already in the threads, I apologise I just haven’t found it yet!

(Hfe) of the following pairs of transistors should be as close as possible
Q21-Q18 (type: 2SC3423Y)
Q11-Q13 (type: BC560C)
Q6-Q7 (model: BC550C)
Q14-Q16 (type: 2SA1360Y)
Q19-Q20 (type: 2SC3423Y, 2SA1360Y)
Q1-Q3 (type: MJE15034, MJE15035)

J1 and J2 must have the same Idss> = 9 mA and must have the same Vgs + / - 1 mV at Id = 6.25mA

J1-J2 (type is: 2SK170)


Each triple of NJL0281DG and NJL0302DG should have the same (as close as possible) Hfe and VBE .
Q2, Q12, Q25 (type NJL0281DG)
Q4, Q5, Q27 (type NJL0302DG)

Thanks
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Old 4th October 2012, 01:36 AM   #348
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Rudi sent payment for the tx, really looking forward to this build. Thanks again.

Can someone post the BOM and build manual, thanks

Sent from my Galaxy Nexus using Tapatalk 2
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Old 4th October 2012, 05:19 AM   #349
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Hi marcus1,

in case of the NJL0281/0302 I ordered 10 each and I was able to find triples less than 1% Hfe. SC3423/SA1360 I ordered 25 each and enough to make two amps. At the MJEs it was not possible to match PNP/NPN for me. I think you have to buy a lot of these to match them as described. There was a discussion about this at a german board and there was nobody able to match PNP/NPN. Rudi told me, he only matched right and left channel.If anybody want to buy original Toshiba sc3423/sa1360 it will be possible at this shop: BG-Electronics and the price is also good. BC transistors I had enough at home. In case of the SK170 matching is possible, but to get the Idss>=9 may be not so easy. Perhaps you can ask one of the diyaudio-members who sell these jfets to get the special Idss. ( fetaudio.com ). There is also an ebay shop ( Resistors, Capacitors Artikel im AudioFET Shop bei eBay! )who sells them very good matched, you have to ask... and the price is also good <3€for 2 pairs. The SK170 I bought from him, were really very well matched....

greetings Arno
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Old 4th October 2012, 06:43 AM   #350
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Wendell, I received your payment. Thank you.

In the meanwhile I have measured all NJL-transistors (Hfe, Vf of thermal-track diode) and will now select (match) suitable triples.
Thanks to EXCEL this is not a big job.

Best regards - Rudi_Ratlos

P.S. Wendell: I have sent the Builder's Manual to you.
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Last edited by Rudi_Ratlos; 4th October 2012 at 06:45 AM.
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