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  1. OLIVE2222

    rs232 tx to XLR audio

    log RS232 data on a audio track is not very efficient. It's closser from a digital strorage oscilloscope than a digital logger. You are going to use 24 bits where only one is needed. Program like terra term can log RS232 data in a text file. However it's possible and I guess you may have some...
  2. OLIVE2222

    Suggestions for proximity alarm circuit?

    Maybe it can be done other way around. Use any method to detect the basket filling (PIR, IR barrier..) but add a temporary alarm disabling push-button who can not be pressed by Confetti (will work for other dog's too :) ) Olivier
  3. OLIVE2222

    Suggestions for proximity alarm circuit?

    Well, a short range emitter/receiver can be developed but is not that easy. Is a waste basket with a cover not suitable? Olivier
  4. OLIVE2222

    digital multimeter sinclair dm 450

    So tell us more, what's the failure ? is there any visible sign of components failures(burns, leaks,..) .
  5. OLIVE2222

    help on LT1073

    You can order a LT1073 free sample on linear technology web site or order it at digi-key: http://www.digikey.be/product-search/en?x=0&y=0&lang=en&site=be&KeyWords=LT1073
  6. OLIVE2222

    Shotkky diode used with switching regulator Lm2576

    TI as a online simulation tool where you can optimize components selection to balance efficiency/cost and size. A good way to try various diodes.
  7. OLIVE2222

    ECG Circuit

    The aim of the optocoupler is to isolate the user from the measurement equipment, here the scope. If you use the same power supply on both isolation sides the isolation is bypassed and the user can be exposed to electrical shocks. You project is hosted by a college of engineering, assuming...
  8. OLIVE2222

    Voltage conditioning circuit

    here under links about the analog way to do it: http://www.ti.com/ww/en/bobpease/assets/AN-31.pdf http://educypedia.karadimov.info/library/AN-311.pdf Not that easy but can give pretty good results, you can use a simulator like LTspice to check it out. The Kris µC solution is however far more...
  9. OLIVE2222

    Peak voltage output for each stage, voltage ramp input

    Here a link to a related post: https://www.electronicspoint.com/hold-output-variable-voltage-source-t267524.html but yes more information's are needed
  10. OLIVE2222

    digital multimeter sinclair dm 450

    Hi, Sinclair merged with Thurlby Electronics Limited to form TTI (Thurlby Thandar Instruments Limited). Your multimeter looks to be the same as the Thandar TM355. You can have a look in that direction for the schematic, also what's the faillure and do you already open the case ?
  11. OLIVE2222

    ECG Circuit

    A transformer,can be used but you need a circuit to drive it. An isolation amplifier can be used too, see here: http://www.ti.com/lsds/ti/amplifiers-linear/isolation-amplifier-products.page The used optocoupler (or equivalent) can't be make linear. However linear optocouplers exist like the...
  12. OLIVE2222

    induction problem

    Hi Philip, Ok, let start with the docs: http://www.velleman.eu/downloads/0/manual_k8000.pdf http://www.bvsystems.be/k8000.php https://www.ghielectronics.com/catalog/product/256 Is swapping the board 1(or2) with the board 3 give the same results? Is it working OK with shorter cables? Moreover...
  13. OLIVE2222

    ECG Circuit

    with both sides of the optocoupler sharing the same power supply, how the isolation is provided? Is the optocoupler linear?
  14. OLIVE2222

    What are these things?

    Don't have read all the posts thoroughly but looks like the E components designator meaning is still unsolved. My guess is that the are multilayer varistors type ESD protection like those one's. http://katalog.we-online.de/en/pbs/WE-VE They looks like capacitors (brown to black colored)...
  15. OLIVE2222

    How to hold the output of a variable voltage source?

    Indeed infinite is somewhat a star trek concept but it's also close to the time my wife need to-free up the bathroom :D
  16. OLIVE2222

    How to hold the output of a variable voltage source?

    An ADC+DAC can be used to build a infinite hold time S&H as here under: http://www.next.gr/meter-counter/Checker-Circuits/sample-and-hold-circuit-ii-circuit-l15006.html the circuit is a bit "outdated" but the concept is still valid. It should also be possible to clock an up/down controlled...
  17. OLIVE2222

    Transistor Question

    The ON semiconductor 2n3055AG datasheet also display the MJ15015G with a VCEO of 120V http://www.onsemi.com/pub_link/Collateral/2N3055A-D.PDF This can be a good replacement candidate (and still available at Mouser)
  18. OLIVE2222

    Transistor Question

    2N3055 A and AG versions are still available at mouser http://be.mouser.com/Semiconductors/Discrete-Semiconductors/_/N-awhng?Keyword=3055&FS=True&Ns=Pricing|1 Care must be taken when replacing the transistors to ensure both good thermal contact and electrical isolation with heatsink...
  19. OLIVE2222

    1.2 V Power Supply Voltage drop

    you can use a TS922 if you want to stay with opamps for the 1V2 power supply http://www.st.com/web/en/resource/technical/document/datasheet/CD00001188.pdf Concerning the circuit 2, depending on both step-up operating and start-up voltages it may happen that you only have the V_I/O&V_core or...
  20. OLIVE2222

    Voltage Regulator +Negative Voltage Generator

    Maximum current will be around 10mA. The output is a bit lower than twice the supply voltage they are no load regulation but it's fit the needs for a LCD neg bias. I have used such config with 2 of the MAX3232 drivers for a debug port and a large 4X20 LCD. Olivier
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