What is this circuit component?

[Skippy]

There's some other Wilson ccts on here, the 710 has a 220.0 crystal exactly like yours: Zip file:

http://www.geotech1.com/forums/attachment.php?attachmentid=5325&d=1212523464

Parts list: txt

http://www.geotech1.com/forums/attachment.php?attachmentid=5339&d=1212613891

Taken from this thread:

http://www.geotech1.com/forums/showthread.php?14255-quot-OLD-FORGOTTEN-METAL-DETECTOR-S-quot

Also: Coin Select pcb:

http://www.geotech1.com/forums/attachment.php?attachmentid=21899&d=1351758761

Regarding testing the part, you could probe around the nearby IC with a 'scope looking for 200 KHz / 100KHz etc divided down digital signals.
Or you could remove it from the PCB and make up a simple logic gate inverter based crystal oscillator, eg. 4000-series logic (CD4020 for example).

[Arthur-Canada]

It's on the circuit board of my 25 year old Wilson Relic and Coin ll metal detector. I think I may have damaged it with heat resoldering all the connection on the board.

[kt315]

Anyone know what is this component labeled 8838?

[ATTACH]36975[/ATTACH]

8838 is manufacture data. see 220.0 k - probably 220 pF and k is a voltage. http://bookz.ru/authors/andrei-ka6ka..._982/i_007.png
--- 63V

[Skippy]

OP = Original Poster, that is the person who started this thread....... and then abandoned it?

[Polymer]

Looks like the OP is reverse engineering the cct ....

What does OP mean or stand for? Thanks!

[moodz]

Looks like the OP is reverse engineering the cct ..possibly removing some sort of potting / epoxy .. note also the chip iss have been scratched off. If the OP could post a picture of the back of the component then we could refine our opinions. Dont think its a glass cap though ☺

[Skippy]

I've been working with SMD as a hobbyist since 1980, and professionally since 1984.
Regarding this specific package/part, that was in 1988, when a 3.6 MHz crystal in this SMD package was used as part of a synchronous motor driver. It was a troublesome part, the oscillator frequently didn't start, and we ended up substituting it with a 3.5795...MHz ( NTSC TV) crystal in a small leaded cylindrical package, fixed in place with glue, and with the leads bent all over to reach the board pads. Ugly, but it worked.

It's hard to estimate how old the equipment shown in the original post is, but late 1980's / 90's seems likely, so SMD parts would definitely have been available. I'm curious about the original leaded part the circuit was designed, I suspect it was probably a ceramic resonator, like those made by Toko (CRL,CRK series) and Murata. They were quite commonly used at 455 KHz for radio circuits, but I have seen them down to 100 KHz.

[kt315]

skippy... did you see THAT in SMD... in 70-th?? i see you so young and thinking there was SMD )))))
you are new generation people are not able to grasp lamps era... simple glass oldier cap is something of quartz or 'tuning fork crystal' for you )))))
you even absoliutely do not know THE fact that there were glass capacitors using everywhere )))

[moodz]

You can tell from the date code its not likely to be smd.

[Skippy]

I assumed his example was a standard SMD one, with wires hand-soldered onto it, so it could be used on the through-hole board.

[moodz]

Tuning fork crystal by STATEK. 220 KHZ ... similiar to these ( 32.768 Khz ).

http://www.ebay.com.au/itm/QTY-100-CX-1V-32-768KHz-STATEK-32-768KHz-TUNING-FORK-FOR-PIERCE-OSCILLATORS-/111069298109?hash=item19dc3efdbd:g:VXsAAOxymcdRidGB

your picture shows an older version ( round leads )

[Skippy]

It's a tuning fork crystal, 100%. I would assume 220 kHz, it's a package I've come across before, CC1V, I think, though that may be with a metal lid, rather than the glass? top.
Edit: See here.

http://www.directindustry.com/industrial-manufacturer/tuning-fork-resonator-100861.html

[kt315]

no no. desolder it and measure on C range.

[Phiphi]

Could it be a 220 uF capacitor ?

[kt315]

glass capacitor. use GOOGLE.