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  1. 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 )
  2. polyal

    treble control centre frequency

    how can i change the centre frequency from 12k (stated in the spec ) to 6k thanks ♪reg♪
  3. 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
  4. polyal

    ptc thermistor

    can i use a fuse type ptc thermistor as a power tool ( drill ) heat sensor..so the charging process ceases when the battery pack reaches the permitted max temperature allowed by the charger circuitry the charging stops when the thermistor exceeds appx 600R
  5. polyal

    Triac Testing

    I thought the resistances between terminals of a triac should read o/c with a ohmeter...i have a batch of BTA 20A 600B ( 10 ) that all read appx 100R or 0.4v between T1 and GATE ? is there an explanation for this apart from ' bin them they're faulty ' regards reg
  6. polyal

    connecting 2 transformers

    i have two identical transformers 240v / 21v sec can they be configured to give me 21-0-21 regards polyal
  7. polyal

    60v too high

    i need to replace a 300w stereo power amp ( board ) with a 100w stereo power amp can i drop the 60-0-60v dc supply to 35-0-35v dc without replacing the transformer? regards polyal
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