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  1. OLIVE2222

    Rogowski coils

    Have seeing them on marketed energy management module. It's very easy to install as no cable is to be disconnected. Current transformers are more popular but cables need to be disconnected (still being non intrusive method) Olivier
  2. OLIVE2222

    Voltage Regulator +Negative Voltage Generator

    Hi, If you have a MAX232 (or3232) on the board you can have neg bias supply for free or you can use one just for that purpose. Olivier
  3. OLIVE2222

    Need advice building new TIG foot control

    Please note that the DC input will be around 17V the 24 volts AC being half wave rectified. With the 1K resistor the zener current will be low so the zener power dissipation, 400-500mW type will already be OK Olivier
  4. OLIVE2222

    Amplifier circuit for Arb generator

    When OK with the mockup you can maybe go for this implementation : http://www.pmillett.com/pwrop.htm The PCB for the project is available on Ebay, this will make thinks very neat. Also chose R CL according to your 1Amp limit Olivier
  5. OLIVE2222

    Need advice building new TIG foot control

    OK so. On the components side ensure that capacitors voltage rating are adapted. Must be at least 25V for C1 and C2. potentiometers must be ruggeds as the connectors and yes mechanical side will be a bit challenging. Guitar volume pedal can maybe be re purposed. Olivier
  6. OLIVE2222

    Need advice building new TIG foot control

    Well, the circuit is quite basic. The main problem however is to list a product for which you don't own the rights. The "vast" payed amount include the engineering cost, the storage cost, the cost linked to legal aspects and warranty... not only the parts cost!
  7. OLIVE2222

    Amplifier circuit for Arb generator

    Oups Indeed . However others are listed on the same page, the OPA548 should fill the OP needs. Olivier
  8. OLIVE2222

    Amplifier circuit for Arb generator

    TI have high current op amp, have a look here: http://www.ti.com/product/opa561 Olivier
  9. OLIVE2222

    Any advice or material to help make a box that makes a sound?

    here maybe: http://www.musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&VPW=1856&VPH=820 fun stuff with few means, look at the site for other stuff too. Olivier
  10. OLIVE2222

    LED Spectrum Analyzer Wall - College Project

    Hi, If allowed for your college project the Bob way will be indeed lower cost and moreover closer to what you can find in modern product. For the "old school way" yes 20 BP filters (maybe a LP for the first one and a HP for the last one) . Don't think that dedicated IC's are available. The...
  11. OLIVE2222

    Li ion (2.7v to 4.2v) to regulated 3.3v

    Hi, i am with Bob, because of the battery abrupt end of life curve you can go for an LDO with an output value close the lower possible working voltage. Can even be lower than 3V3 if the board is self contained (i.e. no need for extenal 3v3 I/O) maybe 2V7 or 3V. Olivier
  12. OLIVE2222

    Ultrasonic cleaner circuitry repair

    waouw that size of carb, right small Ebay cleaner will not do it, or you need to bought a Goldwing GL50 :-)
  13. OLIVE2222

    Ultrasonic cleaner circuitry repair

    Hi, Yes you can go for an equivalent, be aware that some parts can be plain fake. On the other hand you can buy decent ultrasonic cleaner on Ebay for around 30$ http://www.ebay.com/itm/Mini-Ultrasonic-Cleaner-Cleaning-220V-60W-/330695277039?pt=LH_DefaultDomain_0&hash=item4cfef979ef They...
  14. OLIVE2222

    Ultrasonic cleaner circuitry repair

    Hi, According to the OP schematic, transistors are SJ9089A made by Motorola. i can't locate a datasheet but they are avialable here: http://www.plccenter.co.uk/en-GB/Buy/MOTOROLA/SJ9089A?redirect=true But indeed Steve better to find out why they failed however the rest of the the...
  15. OLIVE2222

    Homebrew passive antenna coupler

    Never ear about "three" before, nice learning. For the coupling matters look's like Y2KEDDIE provide very handy information's cheers, Olivier
  16. OLIVE2222

    Homebrew passive antenna coupler

    Hi flippineck, I have few doubts about your post, why do you believe that 2100Mhz is used in your phone, are you sure about the bottom antenna location, are you sure about the jack lack (because it's needed for a car kit). What's your Xperia phone type ? Olivier
  17. OLIVE2222

    bipolar proms

    Hi, No the Willem programmer can't handle the bipolar proms. Arlabs guys made bipolar prom programmers: http://www.arlabs.com/device.htm#BIPOLAR PROMS You can also go for the modern (re-programmable)equivalent of the prom...
  18. OLIVE2222

    Ultrasonic cleaner circuitry repair

    Hi, You can test the transistor with the diode check position of a multimeter, like this: http://www.allaboutcircuits.com/vol_3/chpt_4/3.html We don't know if its a PNP or a NPN but it's the same method to test them. We can assume that the" shel"l is the collector, the 2 leaving pins are to...
  19. OLIVE2222

    Ultrasonic cleaner circuitry repair

    Hi, Looks odd that both drivers fail exactly at the same time. Guessing that the fan still cooling them can be a main surge or a dry run. Anyway you can isolate the diodes (the 225 and the 306's ones) and test them. Same for the transistors, the package should be the collector you can test...
  20. OLIVE2222

    Wanting some help/ advice on a mini greenhouse

    Hi, As stated by Steve a microntroller is almost a must for your project. The DHT11 is a popular and cheap humidity sensor (don't seems as precise as advertised by the way). You can handled your project with an Arduino board and C language via the free Arduino IDE, the community is HUGE...
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