Circuitbenders Forum

Circuitbenders Forum => Drum machines => Circuitbending discussion => circuitbenders.co.uk CB55 - DIY Boss DR55. => Topic started by: Circuitbenders on August 04, 2014, 01:02:41 AM

Title: Use 2SC945 and NOT 2N945's
Post by: Circuitbenders on August 04, 2014, 01:02:41 AM

I just noticed that up until now the build guide text said 'Roland/Boss used 2N945's in virtually everything they produced during this era, so this is what we've specified here', when it should read 2SC945 and not 2N945. It says 2SC945 in the actual parts list, so hopefully nobody has gone and bought 2N945's as they are PNP and won't work. Apologies for that mix up. I've just updated the build guide.

Title: Re: Use 2SC945 and NOT 2N945's
Post by: 01012k7 on August 17, 2014, 12:10:49 PM

Hoping the ones I used are ok they are the ones I used for x0xb0x but mark c945 ???

Title: Re: Use 2SC945 and NOT 2N945's
Post by: Circuitbenders on August 17, 2014, 12:23:13 PM

C945's are the same as 2SC945's. They just cut off the 2S to save space for the label on the body.

As long as they aren't N945 then you're alright

Title: Re: Use 2SC945 and NOT 2N945's
Post by: netpusher on March 02, 2015, 04:33:57 AM

Hi!  my first post here, starting my build on the CB55 finally!  Would 2N3904's work for this?

Title: Re: Use 2SC945 and NOT 2N945's
Post by: Circuitbenders on March 02, 2015, 12:04:15 PM

possibly, but i think the pinouts are different, so you'd have a nightmare time bending the legs of every 3904 to fit properly.

Title: Re: Use 2SC945 and NOT 2N945's
Post by: netpusher on March 03, 2015, 07:44:58 AM

Ahh, thanks for that info, I had a ton of those 3904's but it's not worth the bother.  Looking on mouser, I am wondering if  the Fairchild KSC1815YTA would be a close fit as far as pinouts and voltage specs to the 2SC945?

Title: Re: Use 2SC945 and NOT 2N945's
Post by: Circuitbenders on March 03, 2015, 10:45:19 AM

if i recall correctly, Roland used 1815's in a lot of TB303's as a drop in replacement for the 945's, so i guess they should work fine.

If you're buying from Mouser, why not just use 945's anyway? They stock KSC945's.

Title: Re: Use 2SC945 and NOT 2N945's
Post by: gert on March 03, 2015, 02:43:48 PM

your pinout bending nightmare is my daily business ;)  (being an euro nut working in eastern europe, hard to get supplies)

Title: Re: Use 2SC945 and NOT 2N945's
Post by: netpusher on March 10, 2015, 03:42:19 AM

Thanks!  I picked up the KSC945's, for some reason I wasn't thinking of the modern version of the 2SC945's.  I have everything together, but I am not getting any sound.  I went through the troubleshooting guide, but was wondering if there are any specific voltage values or wave forms I can scope for at certain points in the board to figure out my issue? 

Title: Re: Use 2SC945 and NOT 2N945's
Post by: voodoolikeudoo on March 16, 2015, 10:28:35 PM

Check you're getting 9v and 6v at the regulator outputs.

 I had them both in the wrong way round on mine. DOH!

Title: Re: Use 2SC945 and NOT 2N945's
Post by: Circuitbenders on March 16, 2015, 10:30:57 PM

Can you start a new troubleshooting topic and i'll see what we can do.

Title: Re: Use 2SC945 and NOT 2N945's
Post by: bmaximus on July 22, 2016, 12:57:23 PM

Quote from: netpusher on March 10, 2015, 03:42:19 AM

Thanks!  I picked up the KSC945's, for some reason I wasn't thinking of the modern version of the 2SC945's.  I have everything together, but I am not getting any sound.  I went through the troubleshooting guide, but was wondering if there are any specific voltage values or wave forms I can scope for at certain points in the board to figure out my issue?

Hi to everyone from Rome Italy! This is my first post. I have read this post and I've purchased the transistors KSC945YTA from Mouser. I've finished to assembling the cb55, but does not produce any sound. I checked the pinouts of 2sc945 and is ECB, while the ksc945 is EBC. Now i'll remove all transistors i'll try to bend the legs, if long enough and see what happens...

Title: Re: Use 2SC945 and NOT 2N945's
Post by: ElSmurf on July 31, 2016, 07:04:02 PM

Same problem here as bmaximus. I bought what were supposed to be 2SC945s, they are printed C945 but were actually KSC945s. After bending the 2nd and 3rd leg they work fine.