Pks-digiplan sd2 driver IC help please

**Swarfing** · 24-03-2013

I beg your pardon gents, just checked the search result that i did earlier and i was wrong. close i can get is a darlington.

**asto** · 25-03-2013

Hi to all!
I have a feeling this search is going to end up to a success.
Well, irving2008 sorry for that. What is printed on the plastic part of this transistor is not clear enough. Besides its date code reads 3283 imagine so many years since this was made. The only thing I know for sure is a TO220 package. No data other than what I see.
The closest result I found today was from a cross ref. source PKS-323-01 But their description is totally some other thing. Not even the code as you can see came close.
So, I keep searching.
I'll have a photo of that part tomorrow.
And hey, Swarfing...would you please send the link where this was described as a darlington. Two pieces of information I now need to get this drive back to life. If this is NPN, collector current and coll/emitter voltage.

cheers

**Swarfing** · 25-03-2013

Asto i just checked out those sites that sell obsolete parts.

**irving2008** · 26-03-2013

Asto

looks like that's a digiplan proprietary part number, common anti-copy practice in those days. given the age & specs of the driver i'd suggest 3 options:

1. trace the circuit to determine if npn or pnp then given the spec of the driver (2.5A, 24v IIRC) choose something appropriate in a modern transistor (6 - 10A Ice-max, Vce 100v+, which is likely to be better anyway on Vce-sat and hfe specs). TBH, given other things have may have died I'd not bother.

2. buy a replacement driver off ebay (or check if members such as JohnS have some left over from upgrades)

3. use this as opportunity to upgrade to modern drivers

**asto** · 26-03-2013

Originally Posted by irving2008

Asto

looks like that's a digiplan proprietary part number, common anti-copy practice in those days. given the age & specs of the driver i'd suggest 3 options:

1. trace the circuit to determine if npn or pnp then given the spec of the driver (2.5A, 24v IIRC) choose something appropriate in a modern transistor (6 - 10A Ice-max, Vce 100v+, which is likely to be better anyway on Vce-sat and hfe specs). TBH, given other things have may have died I'd not bother.

2. buy a replacement driver off ebay (or check if members such as JohnS have some left over from upgrades)

3. use this as opportunity to upgrade to modern drivers

It seems I do not have choices here. So I better follow your advise irving but for upgrading I do not have a plan yet. And I think I know of at least one way to test this part off the pcb and see if it is a PNP or NPN.
Thanks.

cheers

**Swarfing** · 27-03-2013

Just a stab?

TIP32C-PKS

TIP32C-PKS - SEMILAB - Ashlea Components

PS

Just noticed their telephone number is a Swindon one?

**John S** · 27-03-2013

Just checked, don't have any of these drives but do have a sack bag of stuff from a couple of Denford Starmill conversions, Need to get these on Ebay.

Also have the guts from a Roland PNC - 3100 and a Roland PNC - 2200

**asto** · 27-03-2013

Originally Posted by Swarfing

Just a stab?

TIP32C-PKS

TIP32C-PKS - SEMILAB - Ashlea Components

PS

Just noticed their telephone number is a Swindon one?

You know Swarfing, that was a hit.
This morning I attached three wires on the board in place of removed transistor and at the other end a triple female socket. Then started playing with several types of transistors that I'd found handy and guess what... The one that made the SD2 play music again was the TIP145. So the TIP32-C is the closest equivalent as its collector current is 3Amps while the TIP145 is Ic=10Amps.
I think the supplier's location is...518, Purley Way, Croydon, CR0 4RE
Conclusion...Very few things may remain unidentified in this forum.
I am glad I've joined.

Thanks!

Ps. I wish to thank Irving as well for helping me to narrow my search_Sorry for any syntax errors.