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  1. ramussons

    Capacitor charging circuit

    There are many ways to charge a capacitor linearly. * Use an OpAmp integrator. * Use a Transistor as a Constant Current source. * Use a Very High voltage to charge the capacitor through a Resistor. * It all depends on the Voltage Range, Capacitance, and the Linearity required...
  2. ramussons

    Bush DAB /FM Radio

    Something in the output stage has failed. That's all one can say with the available information. If you tell us something more about the radio, the make, model.... that will be a better starting point. Photos of the insides, IC / Semiconductor numbers will be much better in working out the...
  3. ramussons

    Landline (VOIP) Caller ID

    A VOIP phone can get calls from normal LL or Mobile phones when one end is switched to a virtual directory number. Callcentric is one such operator. AFAIK, VOIP does not support Caller ID.
  4. ramussons

    What transistor is this?

    You won't get any schematic. Trace the schematic from the motherboard. Takes effort, but can be done. It will be quite a simple layout.
  5. ramussons

    What transistor is this?

    You do not need an exact replacement. If you can do some schematic tracing, you can always get a replacement.
  6. ramussons

    What transistor is this?

    Maybe a BC 435 MosFet?
  7. ramussons

    Views of individual thread counts

    Hexadecimal?
  8. ramussons

    Electronic flourescent tube starter

    You need a High Voltage spike across the tube with hot filaments. Where does that spike come from?
  9. ramussons

    help with a transistor?

    Is'nt there to be another resistor between G and A1 to protect against random triggering?
  10. ramussons

    what mosfet to use for an induction heater

    Induction heating "cook tops" are very common in this country for more than a decade. There are 2 requirements for the vessels being used - Physical shape and material used. Physically, the vessel must be Flat Bottom'ed spanning the coil area. If the spanned area reduces, the heat generated...
  11. ramussons

    what mosfet to use for an induction heater

    Is MOSFET a must? You have an option of IGBT's too.
  12. ramussons

    Geometry issue and error in Philips 27ps55s CRT TV

    I have a 23" Samsung. It works. :D
  13. ramussons

    have motor turn an oval platform

    Something like those Oval Ended baggage delivery in an airport?
  14. ramussons

    Transistor as a switch

    I think it would depend on whether one considers this as a forum of the Hobby'st or Research'ers :D
  15. ramussons

    Dual Power supply switch with 5-10 sec delay

    A specific question - is the requirement A or B? A) When Power at the end point is removed, there needs to be a 5 second break before power is supplied again - source does'nt matter. B) When Source B is activated, Disconnect Source A and Connect B after 5 seconds and Vice Versa
  16. ramussons

    Weird issue TDA7377 amplifier

    I was referring to the initial discussions being hijacked to power output.
  17. ramussons

    Transistor as a switch

    Now, be honest. Did you ever look in to these equations when designing a transistor circuit?
  18. ramussons

    Weird issue TDA7377 amplifier

    Are'nt we digressing from the problem stated?
  19. ramussons

    Transistor as a switch

    Keep in mind, that all Bi Junction Transistors, NPN or PNP are Current Controlled Devices. The Base current.
  20. ramussons

    Weird issue TDA7377 amplifier

    What is your power source? Check its ground return, Earthing...... Maybe some (un)wanted loop.
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