Hi Everyone,
I have what I think is an oscillator supplying a clock for a CPU.
The oscillator has D150E 0 written on it. Could anyone help me
identify this part, and give a modern equivalent?
Thanks!
2013, May 18 - 10:30
#1
Synchro
Hi Synchro,
could you insert a photo for lighter identification pls. & let us know what kind of a package it has?
Kari
0
Thankyou for the replies, but I've now found the fault elsewhere!
What's the best way to test a crystal though? My oscilloscope could'nt
seem to see a clock pulse.
Thanks,
Nick
0
Hello,
In most oscillator circuits, the quartz crystal is driven by a
low-amplitude sinusoidal signal (far from TTL levels) in order
to reduce the mechanical stress. Also, crystals are sensitive
to the applied load capacitance and often will not accept more
than a few hundred picofarads.
If you are trying to directly measure a quartz crystal, simply
connecting the scope leads may add significant capacitance and
could easily stop the oscillation. If the quartz itself seems
suspicious, you should probably to remove it from the original
circuit and test it separately (build a simple oscillator with
it and check the waveform on its output).
If the device is a "canned" oscillator (metal DIL package with
four pins), then its output should provide a standard TTL/CMOS
signal with sufficient fan-out to drive several LS-TTL inputs.
You can hook your scope or frequency counter to it directly.
Best regards,
Jibaro
0
Hello,
Could you please briefly describe the purpose of the circuit
and/or give the exact type of the CPU? This might also give
us a clue in case the frequency markings are ambiguous.
Jibaro
0