Using the HYPNOTIZE as a general shunt reg PCB

Status
Not open for further replies.
I removed the caps and now the smps seem happy...

Is my math right here?

49v input
2.35v across the 10 ohm resistor
1.4v across the 220ohm
output is 5.97v

current = 235 ma

Base voltage is 5.97 - 1.4 = 4.57

Target voltage is 30v, so 30v - 4.57v = 25.43v

25.43v/235ma = 108ohm

I tried a 110ohm resistor in place of the 220 and I'm getting only 5.3v output

I put a 5.1k resistor in and I get 37v, so I'm guessing I moved a decimal place somewhere...

You used the main CCS current in your math where you should have used the 1.4V/220R. You need 3.99K. Parallel circa 20K something to the 5.1K to get in the ballpark.
 
hi, i use Mezmerize to output +-15v, i got -13.8v and +25.2v

how can i fix?

Parts:
Tx: 2x18v 80VA
R1: 2x 47r both side, voltage across (0.23/2.13)
Voltage setting: 2 leds + 1.5Kr ( voltage across (13.8 / 24.6)

heat at IRFP240 but cold at IRFP9240.
 
problem solved.

when flip all SK170 on the pos side and one must do the bend "middle leg" trick, i get the voltage drop finally, then i remember it is some where on the instruction at 1st page...

Another question:

I follow the positive schematic to made another PSU for powering a t-amp and get the 13.8v output without problem, with 225VA 2x18V Tx, i hope to get about 2.5A, so put 1.8//1.8 10W resistor in R1

i found the resistors is quite hot to touch, is this normal?
 
Good news, there is always a reason for a fault, takes care. Yes its normal your resistor(s) will burn enough power, 1.7-2V*2-2.5A. Choose it 3 times more powerful than what it consumes and keep it high off board.
 
Hi Salas,

I'm using half of an old Mez board to make a 5v supply for one of those LDR volume control thingumys.

I have 11.2v AC supply tap from my transformer.

Almost all of the components in place like in your first post.

I'm not hot-rodding obviously (4x leds is about as low a power requirement as you can get), so I'm using 2x68 for the current set. I also have 3 leds in place in first section.

The mosfets are sinked.

I kept all 4 rectifier diodes in there (small ones).

I linked the legs on that k170.

I'm using standard 100uf Panny FC caps, not foils.

I have the 2x leds in the 5 led place and don't know what resistor to try (is it still 220r to test?).

Is there anything else I should swap out to get a low power requirement 5v supply here?

Many thanks
 
Hi Salas,

I saw the "SSR1.1 BiB shunt reg" thread with the choice to use just an outputcap or the zobelfilter. I use the HypnoBlue + rs, so I could try the zobel if the load has a stable currentdraw ?
What would be the advantage of having a more flat impedance , is it audible ?

Erik.
 
Hello!
I have some concerns about the temperature of the first JFets, at both sides near the AC input. After ~1.5 hours their temperature have risen to about 65-70C, which seems a bit high to me. I'm feeding the board with AC 32-0-28V and the output is set to DC 30-0-21.5V
If I remember well the idss of the JFets is between 7.2 - 8mA.

Shall I add a source resistor 10-20 ohms to lower the current through the JFets or buy some other with lower idss?

Thanks!
 
Hypno smoothing section only

Hello,

need help again. I want to power my LDR attenuator with a separate +5V shunt reg. (dvb-projekt one). Before the shunt board I would like to use blue dcb1 rectification and smoothing section only.

2x15 50 VAC transformer plugged, all 4 rectifier diodes in, 10.000uF cap on the positive supply, I'm getting near +24V volts. I was trying to figure out some voltage divider myself with resistors, as I need only +15V for the reg. Unfortunately I couldn't.

How can I get down to 15V after smoothing?
 
It's almost blasfemy cutting up those hypnotize boards.
They do a great job feeding my B2 dac !
 

Attachments

  • P1070363.JPG
    P1070363.JPG
    114.2 KB · Views: 266
  • P1070372.JPG
    P1070372.JPG
    160 KB · Views: 266
Status
Not open for further replies.