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  1. Jimbo bob

    Running high current electric solenoid using a H-bridge

    Hi dear enthusiasts:D, I am planning to run a push/pull 21 lb force electric solenoid. It takes an input of 12 V and demands around 35 Amps (instantaneous I believe) to move between pushed and pull positions. I am planning to run it using a H-bridge with PWM capability. I am hoping to use the...
  2. Jimbo bob

    Servo motor acting strange?

    Hi dear enthusiasts, I recently bought a PS-050 servo motor. It has a lot of torque. Due to some accidents, the wiring that go to the potentiometer and from there to the circuit board (the green, black and white wires) were ripped apart. Moreover, the orange, brown and red wires may also have...
  3. Jimbo bob

    Mixing up AC and DC speakers!!

    Hi everyone:), An interesting thing happened the other day. A friend of mine brought a pair of new speakers to me and let me know that “the speakers have fried”. I let him know that the “frying” smell is probably from his AC adapter because it had a voltage rating of “110V AC at 60Hz” as an...
  4. Jimbo bob

    Sanity check regarding an ADC chip

    Dear enthusiasts:), I am planning to work with a AD7730 ADC. On the page 24 of the datasheet you can read the following (and please by all means have a look if you see necessary): More over.... I have also attached a schematic of what I am planning to put together. My problem is that a...
  5. Jimbo bob

    Multiplexer digital input voltage limits

    Hi everyone:), I was going through the data sheet for ADG706_707 multiplexer. I am planning to power it with +2.5V and -2.5V. When I go to the absolute ratings section on page 5 it says: and then there is a footnote for it: I was planning to feed the digital inputs of the multiplexer (i.e...
  6. Jimbo bob

    Strain gauge dilemma ( Or The Attack of The Gauges!!)

    Hi everyone :), I have 24 strain gauges installed on 24 individual rods (so one gauge per rod. SO MANY!!:eek:). I am thinking about coming up with a circuit which involves only one quarter bridge (do not enough gauges for half bridge and more) which allows all the 24 strain gauges to take turn...
  7. Jimbo bob

    Switching between Multiplexer channels without violating ADC sampling time

    Hi all :), I recently bought an AD7730LBR Bridge transducer chip so I can use it as an analogue to digital converter for my quarter bridge circuits. I am planning to use four 4051 Single 8-channel Analogue Multiplexers to read the output voltage of around twenty four quarter bridge circuits...
  8. Jimbo bob

    The input voltage of the ADC chip

    Hi everyone :), This is probably really trivial, but I could not find an explanation on it. I have attached a section of the PDF data sheet for an ADC chip (ADS1242). On page 2 of the data sheet there is a rectangular box with the title "ABSOLUTE MAXIMUM RATINGS". In that box, in front of "AIN...
  9. Jimbo bob

    Possible malfunction of a quarter bridge amplifier

    Hi dear enthusiasts :), One of my friends very kindly made me a strain gauge bridge amplifier around 6 months ago. I had a little play with it and put it aside. I have attached a picture of the amplifier circuit. The circuit was used to amplify the output voltage of a quarter bridge. My...
  10. Jimbo bob

    The resistance range of a potentiometer

    Hi all :), I am looking to get a potentiometer. However, the manufacturer offers the device in a number of different resistance ranges i.e. 5K, 10K, 20K. I want to connect its output to the auxiliary input of a engine control unit and power it from 12V car battery. My question is should I be...
  11. Jimbo bob

    Clearing doubts on grounding electronics circuitry

    Hi everyone :) I have been having some doubts regarding the grounding of circuitry. At some point last year I had an Arduino Uno (a microcontroller board) on a vehicle. The Engine Control Unit (ECU) of the vehicle was sending some serial data to the Uno through a voltage level converter chip to...
  12. Jimbo bob

    The gauge factor of a strain gauge

    Hi all:), What does it mean for a strain gauge to have a negative gauge factor and why is it useful? Any help or ideas are much appreciated :)
  13. Jimbo bob

    Wheatstone bridge output voltage

    Hi everyone :), I had a go at the first part of the wheatstone bridge question of the attachment and I got a "zero offset" output voltage of 0. However, some of my friends tell me that my answer is not right and I am not going to be able to go through it with them because I cannot get in touch...
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