Search results

  1. colum

    Bicycle generator

    I hurt my knee and need to exercise on my stationary bicycle so I want to attach a DC motor to the wheel to charge a battery I want to add an analog Volt meter and an analog Ampere meter to observe output. but when I quit cycling the battery turns the bicycle in the opposite direction . I would...
  2. colum

    LED IR

    Thanks Heavens 1944 Hop ..That was a well thought out answer and I will try to do it justice...Jeff
  3. colum

    LED IR

    I have many older diagrams on how to hook up an IR Detector and they show from no input Resistor to a Million ohms. I want to hook up an Emitter Led and I figure that input Resistor should be 150 ohms at 9 Volts to an IR Detector that is also 9 volts but what determines the Resistor ( if any )...
  4. colum

    Variable Hertz

    Thank you for the advice Harold ....Jeff
  5. colum

    Variable Hertz

    I am totally confused about responding to responses in this forum and I would appreciate it if someone would let me know if theres a guide somewhere and also if theres a Free Stuff Forum that I can give stuff away. I'm not criticizing Electronics Point its just that I'm getting old and not too...
  6. colum

    Variable Hertz

    [Harald Kapp] Edit: deleted repeat quotes.
  7. colum

    Variable Hertz

    I'm trying to clear up old projects and I need help with this last one. I want to generate an AC signal at variable 350 t0 450 HZ at 115 Volts and about 10 Watts max. a square or Sine or Triangle wave would do and it would be nice if it was based on a 555 since they are easily available and it...
  8. colum

    Wire wrap circuit

    Thanks Steve. Its a shame that the sockets are getting rare, I found you could not reuse them because you rounded off the posts that had a square shape to grab the wire....colum
  9. colum

    Wire wrap circuit

    I've been away for a long time from circuit building and at that time there was two methods that I used one was Getting copper clad boards and chemicals to remove unwanted copper and leaving a copper circuit. The easier one was the Wire wrap and I used it alot. It had elongated legs on IC...
  10. colum

    741 OpAmp

    While I am grateful to all who responded to my simple drawing and a request for the pin out of the 741 and I still did not get the pin out. I just feel that people have the best intentions but are not paying attention to the original request. I did not suggest Dave is on any kind of power trip...
  11. colum

    741 OpAmp

    I find it odd that I posted a circuit requesting a pin out of a 741 Op Amp and not only did I not get a pin out but I got dragged into a long discussion about what I was going to do with this circuit and after threats to terminate the discussion apparently it was terminated.. I think this is...
  12. colum

    Op Amp 741

    The 741 is just going to buffer Hertz signal from a signal generator IC and this 741 may not even be necessary. You are correct about feeding current into meters. The last motor that I was involved with drew 700 Amps at 3 Ph and had all panel meters that were designed for such power with very...
  13. colum

    Op Amp 741

    Well Davenn I do appreciate your attention in all of this but I would like to know what you meant with "Voltage and Power level" I worked on very high Voltage 120 t0 480 Volts unlimited Amps but I'm not too familiar with Electronic jargon. I can send pics of all of these antique meters if you...
  14. colum

    Op Amp 741

    This is a contact type Reed meter that does not require electricity bujt probably senses the armature rotating I have not tested this meter all my motors are 2700 rpm other meters do work on 2700
  15. colum

    Op Amp 741

    Sorry about the confusion but all I wanted was a comment about an OpAmp and I got involved in a discussion about the purpose...anyway I will try to send a pic of some of the Reed meters
  16. colum

    Op Amp 741

    , My meters are all 115 volts and range from 20Hz to Hundreds , All of them that I can check between 20 and 60 Hz work even with non Sine wave.I want to build a circuit to check the 400 Hz. I also have Reed meters that work by contacting the frame of a motor and probably sense the rotating...
  17. colum

    Op Amp 741

    Not sure what you mean by power level but it draws about 7 Watts at 115 V and is just meter not a relay
  18. colum

    Op Amp 741

    These are called Vibration Meters also called Tuned Reed meters, I will send a picture
  19. colum

    Op Amp 741

    I was going to use the 741 just to buffer the signal from a Signal generator into Transistors into a reversed Transformer, the only load on the 741 is the Hertz signal ... The load will be on the - + power supply and the Transistors...Thanks...colum
  20. colum

    Op Amp 741

    Thanks for your very good advice AnalogKid, I wonder about name "AnalogKid" if you need some analog meters I have some for free (just postage) colum
Top