[pistolsnipe]

first of all, thanks for the assistance, and you're awesome brainchild.

the voltage across d5 is 8.86, i am assuming that is supposed to be 12... looks like i ordered the wrong part

resistances are correct, 10k and 6.81 k

here is a pic

edit:replaced with 12 volt unit and everything is now happy, thanks ti!

 

[Lil' Knight]

What's the polar for LED on the S22? I didn't see any - mark.

 

[amb]

The LED cathode (negative) pin is toward the negative bank of the board.

 

[ivanrocks321]

almost done with my two board beta. im looking for decent pot is the Dale 23 Step Attenuator 50K good choice? and is this 1/4 jack good choice also Neutrik NJ3FP6C-BAG 1/4" Female Chass? I can spend more if its really worth the extra cash.

 

[oneplustwo]

I actually don't like the locking ones. If you trip over the wire, everything comes tumbling down... would rather the plug just come out. Plus, it takes two hands to remove the plug. Also, they're harder to mount and wire. I like these.

Work great, simple, easy to use, and cheap!

 

[rhester]

What gauge wiring is being used on b22 builds for power? Especially on the e22 backplane feeding the b22 boards?

 

[oneplustwo]

I've used 16 and 18 gauge on my builds. Stranded is easier to work with. My umbilical for my balanced beta uses 14 gauge. That seems a bit over-overkill but it came as part of my speakon assembly.

 

[tintin47]

Quote:

Originally Posted by ivanrocks321 /img/forum/go_quote.gif almost done with my two board beta. im looking for decent pot is the Dale 23 Step Attenuator 50K good choice? and is this 1/4 jack good choice also Neutrik NJ3FP6C-BAG 1/4" Female Chass? I can spend more if its really worth the extra cash.

If you are using a 1/4" jack, make sure that you read the notes on R34-35 on amb.org to make sure you don't burn up any parts.

 

[johnwmclean]

As there is no device matching category for the σ22 on the AMB site, I assume this is not as critical as with the β22 and not a prerequisite. Does this mean components are acceptable so long as they operate within there specified tolerances?

Another query...
I received an order from Farnell today, IRF9Z34N are different in appearance to the pieces I’ve received from GJA in the past, the data spec is exactly as per AMB’s parts list. Here is a pic:

The two arched notches that are usually seen near the screw hole are straight, and the text is smaller and more defined, it does have the International Rectifier logo though, any ideas? These are intended for my σ22.

 

[amb]

International Rectifier has multiple production facilities in different countries, and they may use different suppliers for their TO-220 package basis. It wouldn't be unusual for a batch to look different than another. I've seen other variations in the past.

 

[johnwmclean]

Thanks Ti!

 

[nattonrice]

Quote:

Originally Posted by johnwmclean /img/forum/go_quote.gif As there is no device matching category for the σ22 on the AMB site, I assume this is not as critical as with the β22 and not a prerequisite. Does this mean components are acceptable so long as they operate within there specified tolerances?.

Check the parts list for the s22 under "Transistors"

 

[johnwmclean]

Oh dear, I blame my old eyes. Thanks Tom.

 

[MrMajestic2]

Ok guys, I need some pointers in the right direction. I have a B22 board that measures 4.5V on R9, but around 3.5V on R10, R11 and R12. Any ideas where I should start looking? Everything looks like its soldered into the right place.

 

[johnwmclean]

Quote:

Originally Posted by MrMajestic2 /img/forum/go_quote.gif Ok guys, I need some pointers in the right direction. I have a B22 board that measures 4.5V on R9, but around 3.5V on R10, R11 and R12. Any ideas where I should start looking? Everything looks like its soldered into the right place.

You might have to dig into the troubleshooting pdf and do some voltage measurements.