baby animal build questions
Moderator: Joe Malone
baby animal build questions
hi guys,
these may be some noob questions, so bear with me.
ive basically built my baby animal pre except I havent attached the input transformer. (I am using the jlm14). What do most people use to mount them off the board? Included in my kit were a couple of plastic washer type looking things which are beige in colour. is this what i use??
Also, the jumpers on the board that go to the transformer with markings of low and high ratio, what exactly does this do for the pre??
Hopefully I'll be able to get this baby up and running over the weekend if i havent blow anything up
these may be some noob questions, so bear with me.
ive basically built my baby animal pre except I havent attached the input transformer. (I am using the jlm14). What do most people use to mount them off the board? Included in my kit were a couple of plastic washer type looking things which are beige in colour. is this what i use??
Also, the jumpers on the board that go to the transformer with markings of low and high ratio, what exactly does this do for the pre??
Hopefully I'll be able to get this baby up and running over the weekend if i havent blow anything up
- Joe Malone
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Yes use sidecutters or a knife to cut the tube part of them to turn them into flat plastic washers that will sit under the JLM14 to hold it 1mm off the PCB so it doesn't short any tracks.What do most people use to mount them off the board? Included in my kit were a couple of plastic washer type looking things which are beige in colour. is this what i use??
The JLM14 only has one ratio and does not need any ratio jumper fitted.Also, the jumpers on the board that go to the transformer with markings of low and high ratio, what exactly does this do for the pre??
Joe
JLM Audio
Capturing Audio without Injury
JLM Audio
Capturing Audio without Injury
thanks for the help joe!Joe Malone wrote:Yes use sidecutters or a knife to cut the tube part of them to turn them into flat plastic washers that will sit under the JLM14 to hold it 1mm off the PCB so it doesn't short any tracks.What do most people use to mount them off the board? Included in my kit were a couple of plastic washer type looking things which are beige in colour. is this what i use??
The JLM14 only has one ratio and does not need any ratio jumper fitted.Also, the jumpers on the board that go to the transformer with markings of low and high ratio, what exactly does this do for the pre??
those plastic washers do a great job .
As im going to be running my BA on 48v I think i need to remove a couple of parts.
I soldered on the *10k and #10k resisters. I take it i need to remove these altogeter and then connect C to E on both BD681 and then also add a connection from pin 4 to 7 on my IC (which is the OPA2604). I think all is ready to go once i sort this part out.
i knew i should have stuck to the dick smith doorbell kit, but the tune it plays would drive me nuts
As im going to be running my BA on 48v I think i need to remove a couple of parts.
I soldered on the *10k and #10k resisters. I take it i need to remove these altogeter and then connect C to E on both BD681 and then also add a connection from pin 4 to 7 on my IC (which is the OPA2604). I think all is ready to go once i sort this part out.
i knew i should have stuck to the dick smith doorbell kit, but the tune it plays would drive me nuts
- Joe Malone
- Site Admin
- Posts: 2081
- Joined: Wed Jan 24, 2007 11:35 pm
- Location: Brisbane, Australia
- Contact:
The *10k and #10k can be left on the PCB as they make no difference without the BD681 fitted. So leave them there and just strap C to E on both BD681 positions.As im going to be running my BA on 48v I think i need to remove a couple of parts. I soldered on the *10k and #10k resisters. I take it i need to remove these altogeter and then connect C to E on both BD681.
If you are using a OPA2604 then you do NOT want the strap between pin 4 and pin 7 as this will kill the OPA opamp because you will be shorting one of its outputs to 0v. The strap between pin 4 and pin 7 is only fitted when using a 99v or other 99* type opamp.then also add a connection from pin 4 to 7 on my IC (which is the OPA2604). I think all is ready to go once i sort this part out.
Joe
JLM Audio
Capturing Audio without Injury
JLM Audio
Capturing Audio without Injury