HISTORY:
Sustainability is the name of the game! Anything (that has been tested and still functioning properly) should be repurposed creating saving in wasted Ee and reducing the poisoning our environment when items are buried in the earth at the local tip needlessly.
Never heard of Ee? It is a concept that creates a measurement of ALL things (not just electronics) that humans have made and the energy used in obtaining the raw material, processing the materials right through to a finished product and even should include the shipping of the item to the distributors/retailers.
If you would like to know more about Ee values, please take a look HERE
Oldies but goodies!
This Silver Mica capacitor is a special precision (0.5% tolerance) silver mica capacitor removed from a piece of high quality Japanese designed & made laboratory test equipment, part of the ADC input filtering system.
The equipment was dismantled not due to any equipment failure (working fine) but it had cosmetic issues and I seriously doubt anyone would have wanted this equipment here in Australia so it has become an "organ donor"
SOSHIN (Japan) is a well known mica capacitor manufacturer, their website is HERE
SOSHIN (JAPAN) - Silver Mica Capacitor
QS25 Series
The Black thermoset resin package looks something like a resistor array, a rectangular "block" with short PCB radial leads which are incidentally Gold plated
Packing is marked as:
QS25 2700PF
+/- 0.5% 50WV
SOSHIN 6130
Tolerance: 0.5%
50V DC
Nominal Value: 2700pF
Termination: radial wire leads originally PCB mounted (2x 5mm length)
Component dimensions: 23.5mm Wide x 8.15mm Height x 2.5mm Thick
TESTING:
Unfortunately my ability to make an accurate absolute capacitance measurement is limited and a component with just 0.5% tolerance is (for me) difficult to check but my measurements were ....
2698pF
2699pF
All this really tells me is that both of the available silver mica capacitors are extremely close in value to each other. As to the actual capacitance reading, my test equipment remaining is pretty "rough and ready" with my dedicated LCR measurement equipment long gone but the readings do seem to indicate that the capacitance SHOULD be pretty close to 2700pF and certainly within tolerance expectations.
COSMETIC CONDITION:
USED
CLEAN
The tinned Gold plated leads remain readily solderable if somewhat short (only for PCB use unless your point to point wiring is very short!
Now stored in sealed, labelled, clear plastic packets
*** Where the photograph shows multiple components, this advertisement is for ONE capacitor only - not all that are shown ***
