Poorly Dinosaur - UK Vintage Radio Repair and Restoration Discussion Forum

Mikey405 · 22nd Jun 2007, 6:47 pm

Hi everyone.

My Dinosaur standards converter died the other day after the new power supply that I installed was rather over-zealous about supplying current. Anyway, I have located the problem but I have no idea where to get the IC from. It is a TSH101N which is long since extinct. I have a 741 in the socket at the moment, but the bandwidth of that is only 1.5MHz and I get a pretty fuzzy picture (Subtitles are barely readable). Can anyone recommend a pin-equivalent IC that I can put in? Apparently the EL2044 is the same but this is almost as scarce as the TSH101N. The pinout of the 741 is pretty much the same except for the greatly reduced bandwidth.

If anyone has any ideas, I would be very pleased.

Thanks everyone.

Kind regards.

From Mike.

Steve_P · 22nd Jun 2007, 7:23 pm

Try these places:

http://www.huskyintl.com/partslist/p...ls/TSH101N.htm

http://www.westchip.com/amd/stock4670.cfm

Cheers,

Steve P

Tazman1966 · 22nd Jun 2007, 7:28 pm

Hi Mate.

I've had a bit of a "google" and have found that there are several American sites that stock them as hard to find or obsolete semiconductors. The only downside is there is a very high minimum order.

Good luck.

ScreenSaver · 22nd Jun 2007, 7:57 pm

Hi Mike,

The EL2044CN is listed as available from Dalbani / Nikko Electronics (www.dalbani.co.uk) priced at £3.02 each and available in singles. Just punch EL2044 into the search box on the website. I've always found them good to deal with. No connection etc, etc.........

Regards,
ScreenSaver

Nickthedentist · 22nd Jun 2007, 8:55 pm

Quote:

Originally Posted by ScreenSaver

I've always found them [Dalbani's] good to deal with.

And me

ppppenguin · 22nd Jun 2007, 10:17 pm

I've probably got some EL2044 in my spares box. PM me and I'll have a look. I've certainly got EL2020 which may work.

ppppenguin · 23rd Jun 2007, 4:26 am

I've looked up the part. It's an obsolete video opamp made by STM. It's actually a TSH10, the suffix is IN, presumably meaning industrial temp range and 8 pin DIP package. The data sheet only listed it in SO8 package. The EL2044 will certainly work and looks like a direct equivalent.

The pinout is standard for opamps which is why the 741 works after a fashion. If you have a TL081 or similar opamp to hand it will work a bit better than the 741 and give you a slightly better instant fix but still not enough bandwidth.

The EL2020 is a current feedback video opamp while the EL2044 is voltage feedback. For many purposes this makes no difference. In practical terms the feedback resistor must be the right value for an EL2020. Too large and you get poor bandwidth, too small and it will oscillate. 820R or 1K is usual for most applications.

I'm pretty sure the EL2020 will work in Dinosaur.

You have a PM.

Mikey405 · 23rd Jun 2007, 7:45 am

Thanks Jeffrey (and everyone).

I just looked at the chip under a magnifying glass and you are of course right about the number. The 2nd "1" is actually an "I".

The 741 was not meant to be a permanent replacement, only just to prove a point. I have some TL081s and I may try one of those in the mean time, but one of those EL op-amps sounds just the ticket.

Thanks again Jeffrey.

From Mike.

22nd Jun 2007, 6:47 pm	#1
Mikey405 Octode Join Date: Jul 2006 Location: Solihull, West Midlands and Beaford, Devon Posts: 1,626	Poorly Dinosaur Hi everyone. My Dinosaur standards converter died the other day after the new power supply that I installed was rather over-zealous about supplying current. Anyway, I have located the problem but I have no idea where to get the IC from. It is a TSH101N which is long since extinct. I have a 741 in the socket at the moment, but the bandwidth of that is only 1.5MHz and I get a pretty fuzzy picture (Subtitles are barely readable). Can anyone recommend a pin-equivalent IC that I can put in? Apparently the EL2044 is the same but this is almost as scarce as the TSH101N. The pinout of the 741 is pretty much the same except for the greatly reduced bandwidth. If anyone has any ideas, I would be very pleased. Thanks everyone. Kind regards. From Mike. __________________ G7TRF

22nd Jun 2007, 7:23 pm	#2
Steve_P Dekatron Join Date: Sep 2003 Location: Bolton, Greater Manchester, UK. Posts: 6,644	Re: Poorly Dinosaur Try these places: http://www.huskyintl.com/partslist/p...ls/TSH101N.htm http://www.westchip.com/amd/stock4670.cfm Cheers, Steve P __________________ If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...?

22nd Jun 2007, 7:28 pm	#3
Tazman1966 Nonode Join Date: May 2006 Location: St Albans, Herts, UK. Posts: 2,193	Re: Poorly Dinosaur Hi Mate. I've had a bit of a "google" and have found that there are several American sites that stock them as hard to find or obsolete semiconductors. The only downside is there is a very high minimum order. Good luck. __________________ All the very best, Tas

22nd Jun 2007, 7:57 pm	#4
ScreenSaver Retired Dormant Member Join Date: Aug 2006 Location: London Posts: 19	Re: Poorly Dinosaur Hi Mike, The EL2044CN is listed as available from Dalbani / Nikko Electronics (www.dalbani.co.uk) priced at £3.02 each and available in singles. Just punch EL2044 into the search box on the website. I've always found them good to deal with. No connection etc, etc......... Regards, ScreenSaver

22nd Jun 2007, 10:17 pm	#6
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: Poorly Dinosaur I've probably got some EL2044 in my spares box. PM me and I'll have a look. I've certainly got EL2020 which may work.

23rd Jun 2007, 4:26 am	#7
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: Poorly Dinosaur I've looked up the part. It's an obsolete video opamp made by STM. It's actually a TSH10, the suffix is IN, presumably meaning industrial temp range and 8 pin DIP package. The data sheet only listed it in SO8 package. The EL2044 will certainly work and looks like a direct equivalent. The pinout is standard for opamps which is why the 741 works after a fashion. If you have a TL081 or similar opamp to hand it will work a bit better than the 741 and give you a slightly better instant fix but still not enough bandwidth. The EL2020 is a current feedback video opamp while the EL2044 is voltage feedback. For many purposes this makes no difference. In practical terms the feedback resistor must be the right value for an EL2020. Too large and you get poor bandwidth, too small and it will oscillate. 820R or 1K is usual for most applications. I'm pretty sure the EL2020 will work in Dinosaur. You have a PM.

23rd Jun 2007, 7:45 am	#8
Mikey405 Octode Join Date: Jul 2006 Location: Solihull, West Midlands and Beaford, Devon Posts: 1,626	Re: Poorly Dinosaur Thanks Jeffrey (and everyone). I just looked at the chip under a magnifying glass and you are of course right about the number. The 2nd "1" is actually an "I". The 741 was not meant to be a permanent replacement, only just to prove a point. I have some TL081s and I may try one of those in the mean time, but one of those EL op-amps sounds just the ticket. Thanks again Jeffrey. From Mike. __________________ G7TRF