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TO-3 SYMASYM

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#881
Michael, I have prepared 2 BoMs:

The 1st one includes the parts for 1 PSU and is shown here:

Warenkorb übernehmen - Elektronik und Technik bei reichelt elektronik günstig bestellen

Its price is about 17€ (per PSU). The transformer(s) is (are) not included.

The 2nd one includes the parts for 2 SYMASYM-PCBs incl. SpeakerProtection and is shown here:

Warenkorb übernehmen - Elektronik und Technik bei reichelt elektronik günstig bestellen

Its price is about 51€.

The price of a complete set of PCBs and components is about 81€ (see below).

You then have to add:

- the offered set of components: 81€
- the components needed for 2 SYMASYM and SpeakerProtection: 51€
- the components needed for 1 or 2 PSUs: 17€ resp. 34€

You need 1 or 2 transformers, heatsinks and a case addtionally.

Best regards - Rudi_Ratlos
 

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#889
Rudi, regarding PSU, is there any purpose the 10 000 uf is not instaled next to bridge rectifier ? I am used to see biggest capacitance just after rectifier.
You will provide also the matched sk170's ?

Congratulations for another great project!


Sent from my iPad using Tapatalk
 
#891
Gentlemen, find attached an update of your orders.

I have changed the SYMASYM's / SpeakerProtect's BoM to include insulating material and spaceholders.
The updated BoM can now be found at: https://secure.reichelt.de/index.html?&ACTION=20&AWKID=940016&PROVID=2084

I have included Silicon pads as insulation material.
Allthough some experts in this forum (like AndrewT. or FranzM) prefer to use MICA washers, I prefer the textile Silicon pads, since they are very easy to handle and the SYMASYM is not an "ultra-high power-consuming" amplifer.
(Please refer to Rod Elliott's article: ESP - Heatsink design and transistor mounting Chapter 7).

ATUPI: I am using two paralleled 2.200µF capacitors directly behind the rectifier to obtain "a low ESR capacitor". The big capacitor is used in the 0R1 / 10.000µF highpass filter.

I do not offer matched input-differential 2Sk170 transistors this time.
There are several ebay-sellers (for example) that offer them.

Best regards - Rudi_Ratlos
 

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#895
Hi Rudi,

thank you for the BoM's and the explanation. Please count me in for 2 complete Sets (4 PCBs and components). Can you please cut the boards into 2 parts: PSU and SYMASYM/Speaker protection.

How does the Paypal money transfer work?

Regards,

Michael
 
#896
@Scalpel: I have attached the BoM as a .pdf - file.

I have already been told that I have included some resistor-values that are not used on the PCB.
I will discard them and give you the updated URL of the BoM on coming Monday.

Please have a careful look at the BoM.
For example: I have included "Soldering Nails - Item No.: RTM 1,3 - 100" and "Solder Lugs - Item No: RF 1,3 -100" (see image below), which account for 5€!
The solder - nails and -lugs are used to connect to the RCA-input and measurement points (for bias adjustment).
If you solder these directly on the PCB, you do not need the nails and lugs and save some money.

Michael: since you do not have a PAYPAL-ID, I will give you my bank account of Hamburger Sparkasse.

I will close this group-buy on coming Monday (August 11th) and will then do a final quote for the PCBs and components.
Maybe that I will be able to decrease the prices a little bit.
I will then give you my PAYPAL-ID (resp. bank account) amd ask you to pay me until the end of next week.

Find attached an update of your orders.

The column "Cut he PCB means": I will cut the PCB into 2 parts: the SYMASYM and SpeakerProtection on the one hand and the PSU on the other.

Best regards - Rudi_Ratlos
 

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#899
interest in the Soft-Power-On PCB

Hi Rudi,

Any chance of adding some "Soft-Power-On PCB" in this run, as found in this thread:

http://www.diyaudio.com/forums/group-buys/187592-3-symasym-23.html#post2920352

When yes, I would like to have 4 of these.

Reason, the trafo below (2x 25V ringkerntransformator 300VA) can be ordered for € 47,43
2x 25V ringkerntransformator 300VA

where this one (2x 25V ringkerntransformator 225VA) has a price of € 62,25
2x 25V ringkerntransformator 225VA

I plan to build dual-mono layout as suggested here:
http://www.diyaudio.com/forums/group-buys/187592-3-symasym-64.html#post3310974

and practiced here:
http://www.diyaudio.com/forums/group-buys/187592-3-symasym-69.html#post3477169
Yea, yea, the heat-sinks shown here are too small, we have been there before 🙂)

So when I order two of the cheaper 2x 25V ringkerntransformator 300VA I need a "Soft-Power-On PCB", to limit the inrush current.

PS. in my previous Post I did forget to add the 1 x 4% paypal costs

Kind regards
Bert
 
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