[Kenny12]

I heard that if your using the proper dynahi power supply, you can actually bypass the dc salvo part, is this true?

Also for the regulators on the slavo, how many amps does it require, i accdently ordered 0.1A ones

 

[Garbz]

are you talking about the servo by any chance

All it does is put out a little voltage to zero the output offset. It's not powersupply related, it's more heat and transistor matching related.

Yes you can get by without it, but your output will drift in time as the temperature of the amp changes. Also they are very low current devices.

 

[dgardner]

Quote:

Originally Posted by Kenny12 I heard that if your using the proper dynahi power supply, you can actually bypass the dc salvo part, is this true?

No, this not true as you state it. The dynahi power supply with the tracking circuit has excellent performance, but is not a big contributor to dc offsets. Variations in LEDs, transistors, and several key resistors are the main contributors.
Quote:

Originally Posted by Kenny12 Also for the regulators on the slavo, how many amps does it require, i accidently ordered 0.1A ones

The 78L15 and 79L15 in the TO-92 packages (0.1A output) are fine. Watch the polarity, one is flipped. Read the datasheet.

Most people seem to install the servo. I would recommend doing it.

 

[Kenny12]

thanks for the reply, i think i ordered everything for the servo, is botique components necessary for it?

 

[robzy]

Quote:

Originally Posted by Kenny12 botique components

Care to define excatly what you mean by that term?

With the Dynalo boutique components are pretty much a waste. The best you can do is go nice resistors as things like caps arent in the signal path.

Rob.

 

[amb]

Quote:

Originally Posted by robzy botique components

Really fancy parts that had received botox treatment.

 

[Kenny12]

i'm building a dynahi but by botique i mean like expensive caps for filtering etc

 

[robzy]

Quote:

Originally Posted by amb Really fancy parts that had received botox treatment.

Last time i tried to give a capacitor botox... well... lets just say it didnt end very well

Its in my opinion that filtering caps are really all the same. As long as they are brand-name and newish i am perfectly happy with them. Others will anwer differently though.

Rob.

 

[Kenny12]

ok i've put all the resistors on the board, i plan on breadboarding R20 to adjust the gain.

is there anything else i should do before i solder the resistors on the board?

also for the 2sa1349 and 2sk389, 2sc3381, and 2sj109, it comes with 7 pins, do i just chop the middle one off?

thanks

 

[Garbz]

Quote:

Originally Posted by robzy Last time i tried to give a capacitor botox... well... lets just say it didnt end very well Its in my opinion that filtering caps are really all the same. As long as they are brand-name and newish i am perfectly happy with them. Others will anwer differently though. Rob.

In my opinion every cap manufacturer makes caps with different ESR and ripple currents. But remember expensive does not always mean good! Datasheets are your friend.


Yeah the middle pin isn't connected so snip snip..