My ballpark rule of thumb for normal non Schottky diodes is about 1.35xVac for full wave rectification. Seems like tying OK. Your secondary It will drop a bit with load, but looks like you are in a healthy range. Its a 120VA after all, has to hold well enough with 200mA CCS. No worries about 50V caps.
Greetings Salas, I am using a couple of your Hypnotize shunt supplies to power a TPA
BuffaloII dac and IV stage and they sound great,THANK YOU, however the heat
generated by the 5.5v,400ma & 12v, 400ma settings are a bit much, at least for summer use. Do you recommend lowering the shunt current,or would the performance of the hypno suffer? I assume that raising the values of the 10R resistors would do the trick. Any suggestions on values to try that would not compromise the shunt supply?
Thanks-
igwt
BuffaloII dac and IV stage and they sound great,THANK YOU, however the heat
generated by the 5.5v,400ma & 12v, 400ma settings are a bit much, at least for summer use. Do you recommend lowering the shunt current,or would the performance of the hypno suffer? I assume that raising the values of the 10R resistors would do the trick. Any suggestions on values to try that would not compromise the shunt supply?
Thanks-
igwt
The dac draws 290ma and the IV stage draws 360ma.
Most of the heat is dissipating from the IV supplies negative side.
Most of the heat is dissipating from the IV supplies negative side.
Last edited:
You are talking both rails added I suppose, else there wouldn't have been much heat in the regs. Also for 400mA setting per rail you could not have 10 Ohm. Maybe you got 2 of them in parallel for setting CCS current per rail?
The dac is a single supply and the IV is bipolar thats 400ma per rail,
The 10 Ohm resistor I was refering to is next to the supply output, it has 65mv across it,would raising that lower the shunt bias on the mosfets so they are not running full throttle?
The 10 Ohm resistor I was refering to is next to the supply output, it has 65mv across it,would raising that lower the shunt bias on the mosfets so they are not running full throttle?
Last edited:
OK I looked at the TP website. Says 290mA positive only for BII and +/-90mA for IVY.
The resistor you refer to has nothing to do with setting the CCS current. The setting resistors are located where the black Hypnotize boards read 68 68, AC connector's side near the edges.
You would need to set 340mA for the BII as good enough, and +/-140mA for the IVY.
You can measure a voltage drop across those setting resistors mentioned. Divide that drop by the resistor value already installed to derive the running current. Project another value to set for the above limits so to keep heat at bay.
The resistor you refer to has nothing to do with setting the CCS current. The setting resistors are located where the black Hypnotize boards read 68 68, AC connector's side near the edges.
You would need to set 340mA for the BII as good enough, and +/-140mA for the IVY.
You can measure a voltage drop across those setting resistors mentioned. Divide that drop by the resistor value already installed to derive the running current. Project another value to set for the above limits so to keep heat at bay.
Hi Salas,
- why not put a 0,22uf Wima cap over the 3 led's, i saw in earlier schematics that there was a capacitor (100uF)placed over the 3 leds.
Do you know what the max. capacity >100uF on the load can be before it harms the lineairity of the shuntsupply ?
Regards, Erik.
- why not put a 0,22uf Wima cap over the 3 led's, i saw in earlier schematics that there was a capacitor (100uF)placed over the 3 leds.
Do you know what the max. capacity >100uF on the load can be before it harms the lineairity of the shuntsupply ?
Regards, Erik.
It will not bootstrap the ref junction well enough if 2.2uF. In some I use that method, but in the Hypno in conjunction with the DCB1 I preferred the high & steady PSRR in the lows than the LF contribution of the lytic in dB but its ESR coupling a bit of noise also. Remember, it was developed as one system. Hence the leg trick also when reg only.
*I would avoid large local capacitors on the load with such a PSU. They make the whole system slower.
*I would avoid large local capacitors on the load with such a PSU. They make the whole system slower.
So, I should not use more than the 100UF on the blue hypno ?
My Ono has long (supply)coppertracks 🙁 with places for elco's at the end of those tracks.
I was planning to put small cap 2x 47uF silmic's there, instead of the original 1000uF.
LOL, if I'm ready with this you would possibly be at version "1.6b-section Z" with the simplistic low voltage shunt regulator.
My Ono has long (supply)coppertracks 🙁 with places for elco's at the end of those tracks.
I was planning to put small cap 2x 47uF silmic's there, instead of the original 1000uF.
LOL, if I'm ready with this you would possibly be at version "1.6b-section Z" with the simplistic low voltage shunt regulator.
Hi Salas,
I have a couple of questions again for you:
Have you ever tried or heard of people using the non-Toshiba K170 fets in your shunt reg, and how were they?
I ask because I have some knocking about that I wouldn't use in the DCB1 or F5 I'm building, but thought they might be OK for this....These are the straight legged type I got from HK on eBay. I believe all the Tosh ones have curvy outer legs.
I have a couple of questions again for you:
Have you ever tried or heard of people using the non-Toshiba K170 fets in your shunt reg, and how were they?
I ask because I have some knocking about that I wouldn't use in the DCB1 or F5 I'm building, but thought they might be OK for this....These are the straight legged type I got from HK on eBay. I believe all the Tosh ones have curvy outer legs.
You mean Linear Systems JFETS? Personally no, I haven't used any. Many Toshiba have straight legs, the curvy outer legged are when they come on a cardboard tape like machine gun bullets.
I think you misunderstood my question, I know how to set the current for the hypno,I was refering to the 10 Ohm resistors near the p.s. output on the black board. Also I'm using TPA's Legato IV stage which is class-A
Last edited:
I told you about those little 10R. They belong in the voltage reference section. They will not change anything about current setting in the regs.
Now about the Legato, they just say 360mA. If it was +/-360mA you couldn't have much heat in a +/- 400mA CCS reg. So it must be +/-180mA I would assume. You could set for +/-230mA for some logical margin and much less heat. For BII set at 340mA. The Hypno plays better when in excess but you may try setting low and see if the loss is marginal in this situation.
Now about the Legato, they just say 360mA. If it was +/-360mA you couldn't have much heat in a +/- 400mA CCS reg. So it must be +/-180mA I would assume. You could set for +/-230mA for some logical margin and much less heat. For BII set at 340mA. The Hypno plays better when in excess but you may try setting low and see if the loss is marginal in this situation.
Sorry Salas I must have misunderstood an earlier post referencing the 10R.
The legato definately requires 360+ mA per rail ,anything less and I get voltage slump.Most of the heat is dissipating from the negative side, both mosfets are hot in contrast with the +side where only one is hot. I may need to do some tweeking with fets or leds . I'm getting 2.41V on the - current reference resistors and 1.63 on the + side
Thanks
The legato definately requires 360+ mA per rail ,anything less and I get voltage slump.Most of the heat is dissipating from the negative side, both mosfets are hot in contrast with the +side where only one is hot. I may need to do some tweeking with fets or leds . I'm getting 2.41V on the - current reference resistors and 1.63 on the + side
Thanks
igwt, how large are the heatsinks you are using ? picture ?
I think you should try resistors with a lower value than 10R to get 400mA.
Can your toriods deliver the current ?
I also have the legato(not build yet) so I'm interested in your "hot pursuit".
I think you should try resistors with a lower value than 10R to get 400mA.
Can your toriods deliver the current ?
I also have the legato(not build yet) so I'm interested in your "hot pursuit".
If it takes 360mA per rail it can't be leaving strong residual heat in a shunt that is set at 400mA per rail except than its CCS Mosfet that will heat up at Vin-Vout x 0.4A. Something doesn't add up here. Put a DVM in current mode in series with negative side. Maybe it draws much lower.
P.S. Dont tweak Mosfets or LEDs, just use each reference drop for different resistor values for target currents. Performance is the same. Its just due to Vf & Vgs tolerances.
acidbrain,
I'm using a 6x6x5/8 inch chunk of aluminum,
I am not using 10R to get 400ma more like 6R & 4R
My toroids are 50VA so should be up to the task.
Salas ,
Your right something sounds goofy It heats-up even without load. Should it do so when not connected ? I assume the - side draws more considering I'm getting the voltage slump from that side when I lower the mA. When I get a chance I will put the DVM on it and get back to you.
Thanks
I'm using a 6x6x5/8 inch chunk of aluminum,
I am not using 10R to get 400ma more like 6R & 4R
My toroids are 50VA so should be up to the task.
Salas ,
Your right something sounds goofy It heats-up even without load. Should it do so when not connected ? I assume the - side draws more considering I'm getting the voltage slump from that side when I lower the mA. When I get a chance I will put the DVM on it and get back to you.
Thanks
- Status
- Not open for further replies.