maalexx
Member
Hi all,
as a newbye there are a lot of things I'd like to know.
First of all, thanks to all people that give so many contributes to realize good limiters with their precious indication.
Before starting up with this project, I've red a lot of topics. It seems that there is not a "common way" for all, it depends on what type of board you use, what kinda transistors you mount on that, what type of signal transformer you choose - and so on and on.
I'm coming from a little experience of LF electronic (I realized little mixers, little amplifiers, easy projects BTW).
Anyway, this topic's going not only to help me if you wanna, but I believe it will contain some useful informations for ALL people that intends starting this wonderful project... so I'm going to post little pictures about my increasing work.
I bought three chassis from www.proelgroup.com: its name, if you like this box, is SCA2ARACK. (please note my ultra-satisfied face )
I received from mnats a couple of his wonderful boards rev J. I ordered from Mouser and Digikey using his BOM and... go!
(mnats parts list: http://www.geocities.com/m_natsume/1176_bom.html)
After half an hour I damaged the boards. I used to handle a 40W soldier (really too much) and did a disaster.
Mnats sent me a couple of previous boards, rev H. I try again with a little soldier of 15W. All appears to be ok.
In mnats rev H board, the input transformer doesn't fit at all with the place of resistor R*. I had to solder this resistor UNDER the board. See this image:
Now, PANIC. I'd like to know what else I have to do.
- In this project I used both input and output transformer, as you can see, and i used for R* and R*1 a value of 12K. ("as lundahl suggests"). Is it right?
- I didn't put: C*1, C*2, C*3, C* and all the optional components of 'input balanced' option (IC2, C30, C31, C32, C33, C34, C35, C100, C101, R1A, R1B, R1C, R1D, R1E, R3, R4). Is it right?
- I measured the voltage. The board returns me not +30 and -10, but +34.7 and -11. Is something going wrong?
- Trim pots R55 and R81 are 2K2 instead of 2K. It's the same?
- The condenser C16 of 33pF is considered "legacy item". I put it on the board for an error. Have I to remove it?
For now I stop with this questions... is this project ready for wiring up?
I'll update, for all, the pictures showing this work step-by-step.
Thanks to all that can help :wink:
maalexx
as a newbye there are a lot of things I'd like to know.
First of all, thanks to all people that give so many contributes to realize good limiters with their precious indication.
Before starting up with this project, I've red a lot of topics. It seems that there is not a "common way" for all, it depends on what type of board you use, what kinda transistors you mount on that, what type of signal transformer you choose - and so on and on.
I'm coming from a little experience of LF electronic (I realized little mixers, little amplifiers, easy projects BTW).
Anyway, this topic's going not only to help me if you wanna, but I believe it will contain some useful informations for ALL people that intends starting this wonderful project... so I'm going to post little pictures about my increasing work.
I bought three chassis from www.proelgroup.com: its name, if you like this box, is SCA2ARACK. (please note my ultra-satisfied face )
I received from mnats a couple of his wonderful boards rev J. I ordered from Mouser and Digikey using his BOM and... go!
(mnats parts list: http://www.geocities.com/m_natsume/1176_bom.html)
After half an hour I damaged the boards. I used to handle a 40W soldier (really too much) and did a disaster.
Mnats sent me a couple of previous boards, rev H. I try again with a little soldier of 15W. All appears to be ok.
In mnats rev H board, the input transformer doesn't fit at all with the place of resistor R*. I had to solder this resistor UNDER the board. See this image:
Now, PANIC. I'd like to know what else I have to do.
- In this project I used both input and output transformer, as you can see, and i used for R* and R*1 a value of 12K. ("as lundahl suggests"). Is it right?
- I didn't put: C*1, C*2, C*3, C* and all the optional components of 'input balanced' option (IC2, C30, C31, C32, C33, C34, C35, C100, C101, R1A, R1B, R1C, R1D, R1E, R3, R4). Is it right?
- I measured the voltage. The board returns me not +30 and -10, but +34.7 and -11. Is something going wrong?
- Trim pots R55 and R81 are 2K2 instead of 2K. It's the same?
- The condenser C16 of 33pF is considered "legacy item". I put it on the board for an error. Have I to remove it?
For now I stop with this questions... is this project ready for wiring up?
I'll update, for all, the pictures showing this work step-by-step.
Thanks to all that can help :wink:
maalexx