Ixys IXCP10M45s IC

[planet10]

I ain't gonna buy no more heatsinks

Dead CRT computer monitors are littered with these little heat sinks.

I bought at least a dozen of these a while back and haven't gotten to them yet.

dave

 

[MikeR]

MU Output

I would be very interested in some of those boards. Makes things so much neater.

Pardon my ingnorance but, is Lo Z the same as MU out? Shouldn't the MU out be on the other side of what is shown as RSTOPB? Can that be added to the board?

 

[protos]

dsavitsk,
Actually you could have like 8 or 10 of those on just one board and then cut them out according to needs to reduce pcb costs.This was done on a recent ccs board group buy.

 

[planet10]

This was done on a recent ccs board group buy.

I know for a fact that people are still waiting for this group buy to percolate to the top of my queue 🙂

dave

 

[Poindexter]

Dead CRT computer monitors are littered with these little heat sinks.

How fortunate. I just contributed my old Dell workstation to Computing Services, down at school.

Brad, Brad!

Poinz

 

[mach1]

Shouldn't the MU out be on the other side of what is shown as RSTOPB?

Yup, just above R3.

pm

 

[sparrott]

Thanks for the head's up.

Thanks for the head's up there Mr Tubelab. The CCS-loaded triode strapped 6JC6A has a much better sound than any of the 6SL7/6SN7 preamp stages I was messing with.

 

[dsavitsk]

Yup, just above R3.

pm

Just to double check, the low Z output should be taken from the opposite side of the stopper in this schematic?

An externally hosted image should be here but it was not working when we last tested it.

I have some room on another PCB, so I am going to do a quick prototype of this to see how it goes ...

 

[Poindexter]

dsavitsk, I copied that schem directly from the one shown early in this thread. Is it correct, or should LoZ out be taken from directly above Rset, instead of above Rstop?

Let me know and I'll get in there and correct it if necessary.

Mahalo,

Poinz

 

[dsavitsk]

I had copied mine directly from you, people suggested that this was incorrect ... and looking back through the thread, the schematic in post #42 has the output below the stopper. The original article does not seem to consider this application (I didn't see it on a quick skim anyway).

By the way, anyone care to enlighten me how to computer the output impedance when taken from between the chips? Taken from the plate it should just be ~rp.

 

[mach1]

Just to double check, the low Z output should be taken from the opposite side of the stopper in this schematic?

Correct. The original schematic I posted showed the output taken from the top of Rset. This is the 'mu stage' Low z out.

The conventional high z out is taken from the bottom of Rset.

pm

 

[Poindexter]

Hotay, I fixed it.

Poinz

 

[Brian Beck]

The low-Z output is from the bottom FET's source, in other words where Rset meets Rstop. As shown, output connection to the top of Rstop adds 1K to the output Z and will probably make the upper FET oscillate.

 

[soulmerchant]

Re: Re: IXYS 10M45S (TO 220 package)

Well Digikey has the fastest delivery I ever witnessed, processing the order started Tuesday morning and the babies are already on my desk!!

And my thanks go to Tubelab for the tip

I still have some extra 10M45S. If anyone in EU is interested, pls drop me a pm.

Hi markanica... Do you have a few of these that you could sell me? 10 pieces would be really nice. I can IBAN or paypal you payment... Please pm me.

thanks,
soulmerchant

 

[Jack Thomas]

CCS

I've got eight of those guys. If anyone wants some, just let me know. They'll be sold at the Digi-Key price, plus shipping. If anyone over the pond wants some, also let me know.

 

[soulmerchant]

Re: CCS

I've got eight of those guys. If anyone wants some, just let me know. They'll be sold at the Digi-Key price, plus shipping. If anyone over the pond wants some, also let me know.

Thanks Jack. I have sent you a PM 😀

 

[WaltJ]

Current Sources Update(s)

I have noted a few references here to my AudioXpress articles on current sources. This has generated substantial interest, and also led to several Letters, to appear in the next issue (Sept.)

Also, a new, follow-on article is currently in work, and inputs are appreciated. If you'd like to comment towards this, use the email link at http://waltjung.org/contactus.html

Since the original article, is has been noted that in a given application which could use either on paper, the Supertex DN2540 tends to outperform the IXYS part. This could be due to the lower C, better noise rejection, or lower ron (see comparative data). Whatever... it just works better, and I have used it as high as 100mA (Rset ~20R).

I agree with those posters advocating the use of the DN2540 cascoded; as such it does work extremely well!

Walt Jung

 

[smoking-amp]

Hello Walt,

Looking forward to your next article.

Might be of some interest to try a mixed IXYS / DN2540 and 2N4391/2/3 (on bottom) cascode, since the bottom JFET doesn't need the large voltage or watts rating of the top device.

Some illumination on how output capacitance changes versus drain voltage and current would be greatly appreciated too. Many CCS devices used for tube circuits operate at substantial voltage drops, but low currents.

best regards,
Don

 

[soulmerchant]

Thanks for the tip Walt. I'm looking to use newer sorts of solid state current regulation in this sort of arrangement:

Ignore all values in this schematic though. It is just an example to show where I want to use the current regs. I'm still not sure how I will reg the second triod's cathode.

I'm using different tubes then in this example, and the B+ is at a solid 400V (measured). More at night, when I like to listen so the IXCP10M45s 450V rating would seem more appropriate.

The full circuit is here:
http://www.audiodesignguide.com/my/el34_pse/el34pse.html

Andrea's board looks pretty scary.. I've built one channel and it sounds superb. I have now finally finished the chassis for two channels (It has taken me way too long).

It would be nice to reg the driver stage current. If I get a bit more gain then I will consider doing away with the feedback. That would be nice...

 

[beamnet]

I have the IXYS now. I'm reading all tis stuff.

Can anyone point me to a (cascoded) ixys used as a current sink in a HV application (110V)?

Thanks a bunch