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  1. dorke

    12 pin Connector

    Welcome to EP. Here is your guy . Here is a general catalog. You have to know the pins functionality, otherwise you may cause damage to the unit!
  2. dorke

    Battery charger questions

    John, What is the model and make of the charger? Are you talking about Lead-Acid batteries? In general, the issue is protecting the battery,the operator and mostly the charger manufacture from lawsuits, not so much the charger itself(which may probably have all the protection it needs...
  3. dorke

    Battery charger questions

    A1: This is probably due to the fact that you had on-hand a constant-voltage charger. These devices are the cheapest and simplest chargers. The charge current is determined by the difference between the charger voltage and the battery voltage divided by the internal battery resistance(+external...
  4. dorke

    39v 8a Laboratory Power supply circuit, Need Help

    Well, If you intend to fry your stubborn and non-educated big ass, you can start anytime... Good luck.
  5. dorke

    39v 8a Laboratory Power supply circuit, Need Help

    It regulates. It isn't a precision regulator but it will do well. The issue of the heat stability in the zener reference is always present: op.amp or not!. Any ways,who says an op.amp is needed? Any "error Amp" will work fine(need to specify the % regulation needed): single transistor(like in...
  6. dorke

    39v 8a Laboratory Power supply circuit, Need Help

    You should specify your needs first ,i.e. define the specs of the power supply. I very much doubt you need a Variable 30V/8A linear power supply. You see ,that is considered a beast in size/weight and price. 240W power supplies are better made in switching mode not linear. (except for the noise...
  7. dorke

    Need Help

    Nothing is connected to J3 and J4. You can connect anything you like DC,AC,Ground,whatever you need to one contact, it will passed on to the other when the relay is energized(i.e-object detected). That is as long as you don't go over the relay contacts limits(see below).
  8. dorke

    Need Help

    The contacts J3-J4 are actually non-dedicated("floating") relay(K1A) contacts. You can connect an ohmmeter to them and check : 1. infinity when nothing detected . 2. short when object detected. You can connect anything you like to them(within relay limits).
  9. dorke

    Signal generator using 555 timer

    Bob, In general I agree with you. It is basically a "definition of needs" and price. I have the classic ("legendary") Tek 465B which I got for about 50$. A DSO is a must for nowadays applications, non-repetitive signals, single shot events.
  10. dorke

    Need Help

    You have all you need in the link you posted above and in this one. Full Specs,calibration procedure and operation. Contacts J3-J4 are normally open,when the board detects an object J3-J4 will close(short).
  11. dorke

    Need Help

    Welcome to EP, Without proper documentation of this board,I don't see how you can use it in anyway. Where did it come from? Like Dave said it is some kind of Sonar receiver board controlled by a PiC uC.
  12. dorke

    Signal generator using 555 timer

    You can get the User Manual of the Tenma 72-6800 here ,similar model (20MHz). You can also contact the company for the exact User Manual. The scope is analog, a very basic model.
  13. dorke

    Obsolete Part Datasheet DZ71100

    It is an ellusive part to find. Closest I could get was this one. I would check it under voltage to find out the zener voltage(11V or 7.1V). Use a DC P.S(start with 12V and then with 15V) put a series resistor to allow about 10-20mA of current and measure the zener voltage.
  14. dorke

    Obsolete Part Datasheet DZ71100

    Is this the diode manufacture part number? Could it be a specific product number? Please post a picture.
  15. dorke

    Signal generator using 555 timer

    Hop, more importantly, is the fact that a 10X probe reduces the scop's capacitance by a factor of 10 ! Probing in high frequency circuits essentially requires a 10X probe. An active probe is another issue altogether...
  16. dorke

    Sensor choice for pond water depth

    Ian, I think the simplest way to solve the original problem of avoiding the manual operation of the filling pump Is 2 wires submerged in the pool at the point(level) of the "full water" in the pool. Since the pool water is conductive once the water reach that level a low resistance will be...
  17. dorke

    Surge monitor

    You should start with the definition of what is an electric surge. While this definition may not be singular, in electric power lines it is usually defined as the excess of voltage or current above the allowed/expected max. peak. The main concern is it's destructive nature, both to the power...
  18. dorke

    Erasing PIC16C54C

    Dental X-ray machine?:eek: Senior,that can mess-up your Kahonas,not recommended... There is also the gentle way , exposure to direct sun-light,1 week should do it;)
  19. dorke

    Need help building a push switch box with indicator light

    Welcome to EP. It is not clear what you want to do. Do you want to extended the distance of the power-on switch and indicator light from the smoke machine? What is the purpose of the momentary switch? What smoke machine do you have?
  20. dorke

    Erasing PIC16C54C

    The history of non-volatile memory actually goes back to magnetic media. Like drums,tapes etc. The first EPROM was invented by Dov Frohman ,an Israeli Engineer working for Intel in 1971(later on was vice president and head of Intel Israel,the little place they invent and design Intel's top of...
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