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 Forum index » DIY Hardware and Software
Dual Monlithic NPN Transistor HELP!!!
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chaotician



Joined: Dec 03, 2007
Posts: 17
Location: folkesteone, kent, UK

PostPosted: Thu Jul 05, 2012 9:16 am    Post subject: Dual Monlithic NPN Transistor HELP!!! Reply with quote  Mark this post and the followings unread

So, I'm building a VCO based on the a schematic I found on the Hearn-Morely website https://sites.google.com/site/hearnmorley/products/hmvco1b/HMVCO1cInternalSchematic.pdf?attredirects=0&d=1, and I'm just putting together a board layout, however I cannot find a source for the LS318 dual transistor, I have found a likely replacement in the form of the Semelab 2N2369ADCSM http://products.semelab-tt.com/pdf/bipolar/2N2369ADCSM.pdf, however it doesn't give an internal schematic, and the other dual packages I've seen show an internal input resistor, whereas the LS318 datasheet shows no internal resistor.
This leaves me with several questions...
    Does anyone know of a UK supplier for the LS318?
    Is the Semlab Chip a suitable replacement?
    Can I use a cheaper dual NPN transistor package?
    Could I get away with using two SMT NPN transistors mounted really close to each other

Thanks for your time,

Matt H
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Dave Kendall



Joined: May 26, 2007
Posts: 415
Location: England
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PostPosted: Thu Jul 05, 2012 9:37 am    Post subject: Reply with quote  Mark this post and the followings unread

some info from the [sdiy] list

Quote:
I've been using LS318/358 (NPN/PNP pairs). Just thought I'd mention that you can purchase, certainly in the UK - unsure on Euro/beyond, from http://www.micross.com/ -- i couldn't order
from L.S. direct- online purchase from small quantities upwards - they quote 4-6weeks typical for delivery, but most orders have come much more quickly.


Quote:
Interestingly enough my experience was almost the opposite. The Plan B M15 oscillator uses the pairing LS318/LS352, and unfortunately Micross don't seem to carry as standard the 318 package used (so as to allow for a drop-in replacement for a repair I was doing) - not only did Micross quote an MOQ of 10 pieces for the 318, but they have a minimum order value of £100 too. So then I called Linear Systems directly, and they were more than happy to send me just 5 off of each - they weren't long in arriving either, and the postage was something silly like less than $2! The total was just over £38 which I was more than happy with!


hope this helps Wink
Dave

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chaotician



Joined: Dec 03, 2007
Posts: 17
Location: folkesteone, kent, UK

PostPosted: Thu Jul 05, 2012 9:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Cheers,

I could kiss you!

I didn't think of the SDIY archive, d'oh.

Thanks for your help...

Matt H
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jackdamery



Joined: Apr 26, 2010
Posts: 73
Location: UK

PostPosted: Fri May 24, 2013 2:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

Could you share this schematic? It's no longer online
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LFLab



Joined: Dec 17, 2009
Posts: 206
Location: Rosmalen, Netherlands

PostPosted: Sat May 25, 2013 10:12 am    Post subject: Reply with quote  Mark this post and the followings unread

BCM847bs? Not as fancy as the LS318, but a lot of distributors have them (for very little money).
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diablojoy



Joined: Sep 07, 2008
Posts: 796
Location: melbourne australia
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PostPosted: Sun May 26, 2013 8:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

you just missed a group buy over on muffwiggler for LS318
but there is talk of another round in the US maybe you could ask nicely
to be included if that goes ahead.

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