Hi,
I'm looking for compact 3 legs vertical regs for a discrete diamondbuffer and to feed a dac chip. I saw some like Acko e.g. use new ultra low noise & speed chips on little pcbs with 3 legs terminal ?
Any ideas or reference please ? the cheaper SQ/P the better.
voltage needed are +/- 5 V ; +/- 15 V ; +/- 12 V ; +/- 18V.
Saw Abraxalito fellow maid a mini shunt reg with TPL150 but seems hard for solderinf on a so little board : as to replace regs like old 75xx/79xx series.
Does the type have an importance : shunt, linear ???? (I mean for digital or analog buffer ?)
Thanks for your help
I'm looking for compact 3 legs vertical regs for a discrete diamondbuffer and to feed a dac chip. I saw some like Acko e.g. use new ultra low noise & speed chips on little pcbs with 3 legs terminal ?
Any ideas or reference please ? the cheaper SQ/P the better.
voltage needed are +/- 5 V ; +/- 15 V ; +/- 12 V ; +/- 18V.
Saw Abraxalito fellow maid a mini shunt reg with TPL150 but seems hard for solderinf on a so little board : as to replace regs like old 75xx/79xx series.
Does the type have an importance : shunt, linear ???? (I mean for digital or analog buffer ?)
Thanks for your help
The thread just before yours in the forum list reminded me that these are worth taking a look at:
Superpower Super Regulator by Belleson photos
http://www.belleson.com/comparemono.php current-step comparison with a few other 3-leg regulators
I'm not affiliated with them in any way, just a clever circuit that has some measurements to back up the results. And a patent, FWIW. 🙂
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Thanks,
Yes I saw Bellessons are good but too expensive : need 6 for a DAC !
Acko maid some TPS7A regs less expensive...
Nikitas seems to make some pcb for a better brand new integrated reg but not in vertical arrengement and don't like the secret price philosophy...
Any older good chip for less than 30 USD ?
Is a shunt reg a good enough option for digital supply of dacs ? Or is there a supplier for such bare pcb Andersonix shows ?
Yes I saw Bellessons are good but too expensive : need 6 for a DAC !
Acko maid some TPS7A regs less expensive...
Nikitas seems to make some pcb for a better brand new integrated reg but not in vertical arrengement and don't like the secret price philosophy...
Any older good chip for less than 30 USD ?
Is a shunt reg a good enough option for digital supply of dacs ? Or is there a supplier for such bare pcb Andersonix shows ?
Shunt regulator is better, but the maximum required current increases the demand for dissipation. If it is low current and current demand is nearly constant, go for it.
Gajanan Phadte
Gajanan Phadte
Ian's one is nice, but there is no -ve reg from him.
There are some TPS7A4700 and TPS7A3301 (-ve) regulators on eBay.
There are some TPS7A4700 and TPS7A3301 (-ve) regulators on eBay.
Hi Andrew
Here you'll find specifications in French :
T495D107M016ATE100 Kemet | Mouser
Mouser part N° : 80-T495D107M16E100
Kemet part N° : T495D107M016ATE100
Tantal - 100µF/16V - SMD 2917 case
Regards
Phil
Here you'll find specifications in French :
T495D107M016ATE100 Kemet | Mouser
Mouser part N° : 80-T495D107M16E100
Kemet part N° : T495D107M016ATE100
Tantal - 100µF/16V - SMD 2917 case
Regards
Phil
Thanks Phil,
I 'm going to check him price (unluckilly him GB interest list are very long... both with names and time... can't beginn my both DAC projects without him I2StoPcm board
: does it take him more than 2 or 3 months ?)
And after the tantal near the dac pin... a good big value polymer for spices and curry and better ESR (if needed !... hum need indian pickles, can is empty !)
I 'm going to check him price (unluckilly him GB interest list are very long... both with names and time... can't beginn my both DAC projects without him I2StoPcm board
: does it take him more than 2 or 3 months ?)And after the tantal near the dac pin... a good big value polymer for spices and curry and better ESR (if needed !... hum need indian pickles, can is empty !)
Eldam,
Parts are those recommended by Ian, check the thread for it 😉
Yes, his GB takes time, let say at least 1.5 month
Regards
Parts are those recommended by Ian, check the thread for it 😉
Yes, his GB takes time, let say at least 1.5 month
Regards
Yes, it's for a DAC chip : like the one of Abraxalito on him blog here http://www.diyaudio.com/forums/blogs/abraxalito/1004-force-sense-shunt.html (the regulated shematic before the shunt) ! But shunt are harder for compact PCB... I use TIP 142/147 to have the more constant impedance with just a fast 0.1 uF at the outside... but unluckily I surmise this technology is to much bigger for the PCB I have ! One of the two project is more easier with space ! I think to use Shunt & Nazar fellow shematics...
Is there some equivalent in integrated chip like all the chips named above on this thread ? One problem of the shunt is it needs to be very near to the feeded device as no local decoupling cap are allowed after it but maybe around 0.1 to 0.2 uF near the pin's device !
@t Korben (arghhh : more than 2 month for me, still waiting because I assume I2StoPcm boards are less needed by diyers...)
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Eldam said:
C'mon dude, where is your DIY spirit? It is DIY forum, make your own regulator.
Quick attempt for Salas Reflektor D shunt regulator in SMT.
All transistors BC857, size 25x16 mm, all parts ~ 3€ @ Farnell.
Edit: original CCS exchanged with simple depletion Mosfet.
Attachments
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Those were using TL431s and I've done more listening and moved on a bit since then. Nowadays I'm building low noise series regs using a 3pin reg (LM350T currently) feeding into an emitter follower (MJE15034) whose base gets fed from a filtered array of TL431s. Happy to share more implementation details if there's interest.
What voltage are you using these Tantalum capacitors at?
Tantalum caps have a terrible reputation for blowing and a recommended solution where they have to be used to to use a voltage rating at least twice the operational voltage.
Would this doubled voltage rating also apply to a solid tantalum cap?
Tantalum caps have a terrible reputation for blowing and a recommended solution where they have to be used to to use a voltage rating at least twice the operational voltage.
Would this doubled voltage rating also apply to a solid tantalum cap?
Yes, of course Abrax 🙂
Seems I need like many to find a drawning soft for pcb !Everybody make its own nowadays... The level of diyers increase... unluckily my knowledge stays close to the one learned at Midle-Age !
But I'd like to try !
@ Andrew : and with the Tantalum :
horrible sound then used for analog output ! But some of those micro ldo regs oscilate sometimes before and/or after if not caps à la Tantalum ! At least this my simple understanding, in the 90°s I liked with 78/79xx regs to use very low 220 uf just after the reg for a wider flater impedance with just a solid tantalum direct between the output and the gnd pin... even sometimes a resistor in serie at outside... but Johnson noise is not very what we want, though sometimes, tweaking simple CD players output stages : it was good enough !Thanks : I will double the voltage value now when using regs which need tantalum caps and used only in digital stages ! 🙂
Is it possible to make it printed with just such picture file ?
Are there somewhere such files free of sharing ? Or at least what shareware would you advise to me for starting to draw simple pcbs after reading the data files of such integrated regs
^^ I would second AndrewT on that one. I always double the voltage on my tantalums, and that is after adding a "engineering 20%" on top of the basic design. Tantalums are expensive little buggers too, even more so with higher voltage.
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