SSLV1.1 builds & fairy tales

[Salas]

Let us know if all worked smoothly on real load when you will apply the new PSUs. If you will feel some better quality also, that will be worth your effort. Good luck.

 

[Backbones]

Will any damage be caused to the BiB voltage reg if there is no load connected?
Will shortly be testing for supply to BA-3.
Chris

 

[Salas]

Full heat on shunt Mosfet sink is the result.

 

[Backbones]

Thanks Salas.
Is there a limit to the length of wire between power supply reg and end component?
Looking at possiblity of remote power supply for BA-3. Current FM4 tuner is connected to BiB via about a third of a metre of wire (perhaps a little longer).
Chris

 

[Salas]

The remote 4 wire scheme keeps good damping but try for as short as comfortably manageable and twisted.

 

[F1 FAN]

Dang I nicely got the regs dialed in but I must have nuked either the DAC or input reciever chip with a static discharge as there is now no output.

 

[Marra]

I am going to build one of these to give 5V for my Optivol/Lightspeed volume control but don't know the power consumption for this. Can someone please advise as to what value resistor to use for the dummy load as I see a couple of guys have already powered theirs this way.

 

[Salas]

I see pictures of Malka07 that used 10R set resistor and 3 green leds in post#7 for optivol. 220R dummy looks OK.

 

[Salas]

Dang I nicely got the regs dialed in but I must have nuked either the DAC or input reciever chip with a static discharge as there is now no output.

Now, that wasn't necessary to happen.

 

[Marra]

I see pictures of Malka07 that used 10R set resistor and 3 green leds in post#7 for optivol. 220R dummy looks OK.

Thanks Salas I'd noticed Malk07 post but wasn't sure about the dummy load for testing. Time to order some parts and get building.

 

[Salas]

Use just 1W dummies.

 

[coolhead]

Anyone try a film cap on Cx05 position? Let say a motor start MKP 20uf 400v capacitor.

 

[qusp]

Dang I nicely got the regs dialed in but I must have nuked either the DAC or input reciever chip with a static discharge as there is now no output.

you are sure its plugged in?

 

[Marra]

Just finished my +5V bib for use with my Optivol volume control which is used in conjunction with a DCB1. I used a 100R and a 500R trimmer so that I could adjust to exactly 5V. Everything works ok with just a 0.01V drift over 30 mins and nothing overheating. There is 1.44V drop across R301 so 144ma would I need to change the value of R301 as I am unsure of the current draw of the optivol. All I've to do now is prize the preamp away from a friend[he likes it a lot] and fit the bib. I hope the improvements are as those noted br Malka07 and Kerux.

 

[necplusultra]

this may be a stupid question but,

can you get a +/- reg with a 20v center tap transformer?

I have a 167p20 hammond lying around.

 

[Salas]

Having just a middle wire it would take 4 diodes between 2 regs not 8. Two for (+) two for (-). Middle wire Y to main cap (-) on positive reg and to main cap (+) on negative reg.

 

[necplusultra]

Thanks Salas.

I think I got it. So I wire 2 into the 4 diodes and send the center tap directly to the caps. The rectified wires: + goes to + of pos cap and - goes to - of neg cap. the Y center tap goes to - of pos cap and + of neg cap.

 

[Backbones]

I have completed one of the split rail BiB regulators for the BA-3 (-25V-0-+25V) It is working fine on a 390 ohm dummy load. The BA-3 front end is incomplete at present. It is being fed from a 25V, 1A transformer. Will I need to attach the BiB ground to the star ground of the other power supply which is providing power to the output mosfets of the amp?
Chris

 

[Backbones]

Second question: I have about 10cm between the BA-3 front end and the regulated power supply. Would I get away with joining the outputs on the BiB board and then having just three wires (+, 0, and -ve) from the board to the front end i.e., not twisting a series of output wires? How critical is this distance?
Chris

 

[Salas]

First question: Better ask in the BA-3 thread since its about a specific system grounding preference and there maybe hands on expertise beyond we may try theorize here.

Second question: It will still work fine, but 10cm has enough finite resistance and inductance that you maybe able to feel the remote sensing benefit if patient enough to apply. Another plan is you get away initially and you try restoring remote sense later when familiar and at leisure. Would be fun to try test just how much 10cm can catch you out or not.