On Thu, 12 May 2011 20:38:39 +0100, "Ian Field"
wrote:
"Jim Thompson" wrote in
message ...
On Thu, 12 May 2011 19:48:06 +0100, "Ian Field"
wrote:
"Sjouke Burry" wrote in message
...
Ian Field wrote:
Running at the full Vcc of 16V and the full frequency of 500kHz the 555
got so hot I had to add a clip-on heatsink.
Tried slowing it down to about 140kHz and the heatsink still gets
pretty
warm.
Is this normal?
Thanks.
Try again at a somewhat lower voltage, you may have exceeded
vcc for this particular unit and/or caused latching somewhere,
in which case almost the black magic smoke comes out.
Almost every datasheet I've seen says 16V - ISTR the Hitachi DS says 18V.
Perhaps a large capacitive load?
Been bench testing with no load (apart from driving the CR) and then with a
BC327/337 complementary emitter follower pair.
Post your schematic or a link.
...Jim Thompson
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