10 Oct
2023
10 Oct
'23
6:08 a.m.
In the circuit I am making repairs two, a BC239 and BC308 are being used to control a 3.6v
memory battery charge circuit as part of a 1990 Ahlborn-Galanti digital sampled
instrument.
I do have the a slightly newer substitute for the BC239.
Thanks
Don Resor
-----Original Message-----
From: WEB via cctalk <cctalk(a)classiccmp.org>
Sent: Friday, October 06, 2023 3:03 AM
To: cctalk(a)classiccmp.org
Cc: WEB <hveit01(a)web.de>
Subject: [cctalk] Re: Obsolete Parts.... Unicorn Electronics
On 06.10.2023 03:10, D. Resor via cctalk wrote:
I recently had a need for BC308 transistors. Of
course those have
been unobtanium for quite some time.
My search beyond a distributor then went to eBay where I found Unicorn
Electronics.
More to the point I see from their website Apple 1, Apple ][ and Apple
1a Kits along with Apple 1 and Apple II parts are available.
I thought some here might find this useful.
https://unicornelectronics.com/
Don, unicorn is known for long for interesting old
semiconductors. I have also ordered several parts from there, even from Europe which
result in rather high shipping and tax costs. Whether the Apple kits are a good deal
though, I have my doubts.
The BC308 is the PNP complementary part to the former NPN work horse BC238. Both are
nowadays difficult to find. However, as they were rather universal types, you can usually
replace them with BC548 (NPN) and BC558
(PNP) today without problems.
Holger