Search results

Search Forums New Posts
  1. kellys_eye

    Stepper motor control as input? Arduino

    What is actually driving the stepper motor? Usually (but not always) there is a dedicated chip - the chip takes a 'step pulse' input along with a 'direction' input. If you can find those signals (get the datasheet for the stepper driver device and look for the correct pins) then you have the...
  2. kellys_eye

    Distorted waveform on Triplett 3432-A sig gen

    Is this a recent fault? Is it simply a factor of the simplicity of the circuit design and the none linearity of the circuit?
  3. kellys_eye

    Musical Instrument Amps damaged by power surge or drop

    When reporting or discussing faulty equipment it is always wise to include the make and model you are referring to. It helps us enormously by giving us the opportunity to look up the technical details/schematics and resolve any problems quicker. However.... If the mains input fuses are ok...
  4. kellys_eye

    How to check 5 pf or 1.5 pf disc capacitor

    You can measure (say) a 100pF capacitor and, if you're lucky, by adding the 5pF in PARALLEL with the known capacitance, see the measured difference (assuming your meter has the resolution). Stand-alone cheap, and reasonably accurate, capacitance checkers are available.
  5. kellys_eye

    PNV 57A Transformer

    The schematic is of a simple voltage multiplier. The diode/capacitor arrangement can be extended 'ad infinitum' to multiply the AC voltage input to whatever DC voltage output you require. You need a simple inverter driving a small ferrite-based transformer - practically any former will do and...
  6. kellys_eye

    What are these buttons called on pir

    If the OP wants 'remote' controls then rather than extend (or add) knobs then he should find the value of the adjustable controls (usually 10kΩ or 100kΩ) and purchase 'full sized' potentiometers and fit them in place of the original parts.
  7. kellys_eye

    Rc car: rf tx to rx

    Is the data from the HT12x modulated in any way? If not, what do you plan to use to achieve this?
  8. kellys_eye

    What are these buttons called on pir

    .... which makes a total mockery of your original post and wasted a whole heap of peoples time :rolleyes: Why did you take the time to publish the original picture AND edit the marking on it to illustrate the bits you (supposedly) want? If they are the same as in that picture then, as per my...
  9. kellys_eye

    Press a button to start a timer project? Thanks.

    I take no issue with the attributes you list - except maybe the 'amenable to changing its behaviour' since the OP wanted a simple stopwatch function and doesn't indicate any need for 'change'.... A PIC, the programmer, the time taken to learn the coding, the display (the 'complex' bit).... not...
  10. kellys_eye

    What are these buttons called on pir

    Well your image looks just like the one I linked to.... ...also, the knobs are the same. If the whole package doesn't 'fit' just buy one to use the knobs it comes with.
  11. kellys_eye

    Portable power pack help

    How about a wiring diagram for the whole unit?
  12. kellys_eye

    What are these buttons called on pir

    Given the whole module is available for £2.29 (about $3), why bother? http://www.ebay.co.uk/itm/Adjustable-12M-Infrared-Motion-Sensor-Detector-PIR-LED-Auto-AC85V-265V-BLK-/302382688340?epid=1794188884&hash=item466769a854:g:M54AAOSwXY5ZSWN5
  13. kellys_eye

    project request

    Not sure publishing your open email contact details is such a good idea..... Either way you sound as if you want someone else to do the majority of the work for you! Happy to answer basic queries via this forum but not to communicate on a 'private' basis to help you get a qualification you...
  14. kellys_eye

    circuit to show how much treble or bass

    .... and WTF is 'ghostown-usa Classic Clicks internet developments'?? Who-, or what-ever they are they haven't got a diddley clue about schematics....:rolleyes:
  15. kellys_eye

    Increase dc voltage

    Depends on what you want to do with it.....
  16. kellys_eye

    DAC controlled voltage regulator

    Even if it was, the LM317 makes the perfect adjustable current regulator too.
  17. kellys_eye

    Using a Voice-Activated Switch to Control My TV Remote Mute Button

    Even your bog-standard 'clap switch' could do the job if you wired the output across the mute button! Should be fairly simple to discover the IR code for the mute on/off signals and wire a serial EPROM to output the relevant string on receipt of a 'clap' or other sound-activated signal. Check...
  18. kellys_eye

    Multi meter question?

    For the amateur experimenter a multimeter with as many functions as possible helps keep clutter on the workbench down to a minimum AND costs lots less than individual purpose-built test equipment. Some of the multimeters out there do the basic Volts/Amp/Ohms and capacitance, temperature...
  19. kellys_eye

    Increase dc voltage

    Use the low voltage to drive a switch that controls a higher voltage.
  20. kellys_eye

    Connect several wires without relays?

    It's otherwise known as 'cross point switching' Many years ago (about 40 to be precise!) I made a simple diode cross-point switch to decode a Single Pole 10-way rotary switch to 7-segment LED display using a diode matrix. Google the bold words to see what I mean (diode matrix in particular)
Top