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  1. polyal

    2.4v NICAD CHARGER?

    i just need to charge 2 nicad batteries ( 1.2v C size ) which will be pemanently installed in this screwdriver ( the original batteries have long been discarded ) is the supplied circuit suitable for charging 2/ B type nicad batteries in series . . my main queerie is . . . is this circuit...
  2. polyal

    2.4v NICAD CHARGER?

    b&d 9018 i just need a generic charger and wondered if this circuit is valid the original charger is a wall wart 5v ac supply with an inline diode . . how good is that ♪♪:)
  3. polyal

    2.4v NICAD CHARGER?

    Q for the geeks I need to build a charger for a 2 cell electric screwdriver (2.4v) i found this circuit on utube will it work . . .thanks edit : op amp powered via pin 8/4( not shown )
  4. polyal

    treble control centre frequency

    thanks for the info ♪reg♪
  5. polyal

    treble control centre frequency

  6. polyal

    treble control centre frequency

    thanks for the info on the freq is there anyway now i can get a steeper slope to the shelving freq ♪reg♪
  7. polyal

    treble control centre frequency

    thanks ♪reg♪
  8. polyal

    treble control centre frequency

    how can i change the centre frequency from 12k (stated in the spec ) to 6k thanks ♪reg♪
  9. polyal

    CONVERT from 15-0-15v to 9v

    thanks for the reply it turned out to be a build fault due to using recycled strip board with cut track ( R10 was not connected to virtual earth ) it has now been rectified and giving a healthy 4v p/p sine wave thanks for your help . . well chuffed ♪reg♪
  10. polyal

    CONVERT from 15-0-15v to 9v

    it works spot on:)with either ground or -ve i'm getting a 1v p/p sine wave ♪♪ ( at the op amp o/p ) is there anyway i can squeeze another 1volt gain out of it it will be used for signal tracing through audio gear typically at line level ( mixers etc ) the circuit is from a vintage soundcraft...
  11. polyal

    CONVERT from 15-0-15v to 9v

    thanks . . i will try that regards reg ps is the pot grounded at the battery negative or should it be at the virtual earth ? ie is the signal relative to the batt negative
  12. polyal

    CONVERT from 15-0-15v to 9v

    i have a mains powered 1khz test tone oscillator i need to make portable i need to convert it from 15-0-15 split rail to 9v ( battery ) this circuit generated 10v p/p what modifications do i need to do to get about a 2v p/p sine wave cheers reg
  13. polyal

    ptc thermistor

    so you dont know either? ...somebody must be able to answer my queery CAN I REPLACE A SWITCHING PTC THERMISTOR WITH A RESETTING FUSE TYPE.. AS A HEAT SENSOR IN AN ELECTRIC DRILL POWER PACK in response to the 2 replies Thermistor temperature sensing is one of the most sensitive properties or...
  14. polyal

    ptc thermistor

    if i could sort it out myself i wouldn't be on this forum asking for advice ?? lets hope i can get a sensible response to repost my queery : can i replace a 'switching' ptc thermistor with a resetting 'fuse' type any sensible info would be appreciated
  15. polyal

    ptc thermistor

    i am not suggesting anything i want to replace a faulty thermistor please read the post....and what i do is my business... so if you dont know dont reply regards ps thermistors are passive components and modern batteries dont have intelligence its the associated active and passive component...
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