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  1. OLIVE2222

    Ultrasonic cleaner circuitry repair

    Hi, The transducers can be piezo type (nor sure about) so continuity test can not be significant. Are both fuse part of a common circuitry or each transducers driver have is own fuse? Being "stereo alike" you can maybe try to isolate the drivers to test them separately. Olivier
  2. OLIVE2222

    Replacement part

    Please be aware that this part must be programmed or it will be useless. A bootlader is integrated, maybe a "certified" repair shop can help on this
  3. OLIVE2222

    Help with PT4115, ESOP8 LED dimming

    Hi, If the dim pin accept both analog voltage or PWM i guess that some sort of integration is done internally. PWM is more adapted to uC interfacing, and analog is pretty easy for manual control, that's it. Both package should react the same way, only power dissipation capabilities can...
  4. OLIVE2222

    Power rating on resistors

    wattage is what the resistor can dissipate not "pass safely through it". All wattage doesn't exist as you find out, so just use one rated above your needs with a bit of margin to be on the safe side.
  5. OLIVE2222

    What is this component ??

    looks to be a thermal switch. Olivier
  6. OLIVE2222

    ATMEGA16 USART problem

    Hi, Also 12MHz don't allow all baudtrate check here: http://www.wormfood.net/avrbaudcalc.php Fuse bits must also be set for external crystal (not the default value if my memory serve me well). You can check the clock with a dumb 1 second interval led blink. Olivier
  7. OLIVE2222

    'headphone' mixer

    Hi, If volume control can be done at sources level you can mix them passively by using capacitors as it : source 1 ---+||---} source 2 ---+||---}----Common output source 3 ---+||---} ..... to be doubled for stereo, capacitor don't need to by high value for headset or small loudspeakers, 10µF...
  8. OLIVE2222

    Need help identifying a thermistor.

    The components logo looks to be the Epcos one. The 2.5 marking should be the maximum allowed current. see the datasheet here. http://www.epcos.com/inf/50/db/icl_12/NTC_ICL_S237.pdf According to the component size you should be able to determine if it' s the good datasheet or if another one is...
  9. OLIVE2222

    Isolated sense of AC mains (240V) voltage and phase

    Indeed as mentioned by Kris standards optocoupler will not do the job. However linear optocoupler can be part of the solution. See: http://www.vishay.com/docs/83622/il300.pdf http://people.ece.cornell.edu/land/courses/ece5030/labs/s2013/appn50vishay.pdf The Kris suggestions to supply the...
  10. OLIVE2222

    Help with Dallas 1-wire circuit

    One wire should be OK, assuming you can find a way to use it in a 12V system. But first being a data bus you can maybe think about a simpler solution for relay control like something based on 8 currents or voltage levels with comparators or µc to decode them . I remember an application like...
  11. OLIVE2222

    any one want to play name that capacitor?

    My guess about the filtering purpose of the cap is based on both is size and is location close to the inductor. Yes we can have same size 1nF/1000V caps close to an ethernet port or close to an isolated DC/DC but here I suspect the cap to be part of a step-down converter, if not where the...
  12. OLIVE2222

    any one want to play name that capacitor?

    Yes have seen it, can be sharper I must said :-) What I suggest are pics from the damaged board without the cap and the cap itself too see if we can reuse it. The right picture is deformed , and to me the left show a somewhat big ceramic cap around 5 X 7 mm according to the 25MHZ HC-49 package...
  13. OLIVE2222

    any one want to play name that capacitor?

    Sharp picture of the board cap location and the cap itself can be useful. For the value using the crystal at the bottom as scaling and because of is proximity with the (step- down) inductor (the circled black part) my guess goes for a filtering value like 10 --> 22 µF maybe. Olivier
  14. OLIVE2222

    Increasing Line 120VAC to 340VDC

    You can have high current 340V DC quite easily with an 120/240V isolation transformer.When rectified and filtered you will have it.
  15. OLIVE2222

    Triangulate

    cellphones also have a Timing Advance information (to handle the echo) that provide a raw information of the distance from the aerials inside a cell. Cellphones also report the levels of the neighbouring cells, handy data to locate them! Outdoor location can be based on signal strength (RSSI)...
  16. OLIVE2222

    Automatic battery charging circuit

    Also TPmicro is not very well distributed, when the chip stop to be the trendy charging chip on Ebay you can be in trouble to source it. Those kinds of components are only OK for experiment or for few pieces production to me. Don' t know what is your purpose.
  17. OLIVE2222

    Need help to ID component

    Looks to be this Mosfet: http://www.irf.com/product-info/datasheets/data/irf6619.pdf
  18. OLIVE2222

    Automatic battery charging circuit

    OK, "high" charging current are not needed so. You can use MCP73831 (or MCP73832) They are linear devices in SOT23 package with limited dissipation capabilities. I suggest to use them at around 350mA , to avoid being on the edge, and to strictly apply the datasheet recommendations about the PCB...
  19. OLIVE2222

    Replacing NiMh in phone

    The battery detection feature can be an asset, knowing that the battery should appear as charged I guess that the provided current will be the trickle one, safer for the LiFePO4. yep not sure that he can distinguish charged NiMh from new alkaline cells (nor the color or the brand :) ). A kind...
  20. OLIVE2222

    Replacing NiMh in phone

    The whatever current you are prepared to accept can be too high as AAA NiMh are in The 800mAh range (for recent one's). If the NiMh are charged around C/3 it' s OK, if it's higher you can exceed the maximum charging current, see: http://www.batteryspace.com/prod-specs/Spec_for_10440.pdf...
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