Totally agree Mike. definitely, no doubts, a crystal OP reread it ... its 12.2x29 the x may be a 0 (zero)Looks more like a cylindrical package crystal from that angle...
12.2x29 the x may be a 0 (zero)
BTW, those two numbers are far enough apart that using the wrong frequency could affect circuit operation, especially in a radio receiver. I'd go with the frequency on the part. Do you have any idea why the frequency on the part differs from the silkscreen number on the PCB?Dave - It says 12.288MHz
BTW, those two numbers are far enough apart that using the wrong frequency could affect circuit operation, especially in a radio receiver. I'd go with the frequency on the part. Do you have any idea why the frequency on the part differs from the silkscreen number on the PCB?
its most likely to be the clock oscillator crystal for that large micro chip to the right of the crystal
I would hesitantly guess ( in this situation) that several 10's of kHz probably wont make too much difference
That's a good ballpark guess for the crystal spec -- at that frequency 16-18pF is very common. Can you see any explicit caps on the PCB on the crystal nets? The total capacitance seen by the crystal oscillator circuit would be the two PCB caps in series (so half of their value) in parallel with whatever the input capacitance of the oscillator is.How can I find its load capacitance? I'm guessing 16pf.
Hard to tell. What is the microcontroller (uC) chip to the right? Can you read a part number off of it? If so, the datasheet for that part may specify a particular crystal capacitance value, and recommend the corresponding PCB capacitors to get to that overall parallel resonant capacitance value.I really cant tell what the caps are - Im still very new to circuitry.
What would happen if I placed an incorrect crystal on this board?
You would need an LCR tester, or a "capacitance" test range on your DMM to measure the caps. They would likely be in the 30pF range.The SMT's are so small, there is nothing printed. I tried to get a picture, but my phone has no macro setting so close up photos are blurry. I'm going to hunt for the manual, but I doubt I'll find it.
well he thought it was a capacitor initiallyWhy fix the crystal if it ain't broke? The brown stuff looks like glue to hold it in place.
And you wouldn't have the wherewithall to test it in any case. It will measure as an open circuit / very small capacitor. I guess if it had the damp in it, you may measure some conductance.well he thought it was a capacitor initially
but it still begs the Q you asked .....
JoshB ... why do you want to replace the crystal ? it doesn't look damaged
This thread so so far offtrack because of things not being established in the original post
I think you need to start over and tell us all why you are delving into this receiver audio board unit and what is its fault / symptoms ?