General > General Technical Chat

Where have you actually come across a 555 timer in the wild?

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deth502:
the device we use at work to check the depths of our test wells has one in it. 

NiHaoMike:
Found one on a TI 5V to 12V boost converter module. It was used as a charge pump to derive the initial MOSFET drive voltage.

poorchava:

--- Quote from: BravoV on March 31, 2014, 03:50:38 pm ---Ancient HP laserjet printer Jet-Direct Ethernet add-on board that still uses thick coax ethernet 10Base2 and the "newer" RJ-45 interfaces  ::), remembered salvaged few TLC555 (cmos version of 555) from dumpster drivings while ago, mostly people throw them away in bulk.

Actually what I love to salvage is the BNC connectors, the older ones are quite good, all brass with thick nickel plating construction.  :-+

Something look like this


--- End quote ---
I actually use on like this in my printer :) Had to buy it because the new PC didn't have LPT anymore, and my LaserJet 4000 is uber-reliable and uber-economic workhorse (despite being a 20kg 40x40x40cm).

dfmischler:
Many years ago I repaired a friend's electronic dog collar that used a 556 to drive the transistor that charged the coil that gave the shock.  That was a very old design, though; it had two boxes on the collar: one for the radio and "shocker" and another for the Ni-Cd battery.  I think it was a Dog Radartron 300DT.

magetoo:
IIRC, the Commodore 64 had one for debouncing the RESTORE key.

That particular key was hardwired to the NMI line; I guess having bursts of unmaskable interrupts while the key settled would be bad.  You also often had to hit the RESTORE key pretty hard before it did anything, no idea if this was the reason.



--- Quote from: Phaedrus on April 01, 2014, 12:27:19 am ---They get used in cheap PC motherboards some times to drive the motherboard speaker. Other times they use a piezo, or on higher end boards they'll use a more advanced audio chip.

--- End quote ---

Are you sure?  I thought this function was integrated in the chipsets everyone use.  (Or is it considered "legacy hardware" nowadays and has been dropped?)

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