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  1. crutschow

    House vs apartment

    The worst thing I found about living in an apartment is noisy neighbors, where the sound (loud voices and/or music) comes through the walls, and also hearing people on the floor above walking around or doing exercising (ten minutes of jumping jacks can drive you crazy). It could be OK if the...
  2. crutschow

    Basic transistor switch

    As noted frequently on these sites, that's not good design practice when using the transistor as a switch. A forced beta of 10 is the usual value used.
  3. crutschow

    Receiver DENON AVR-4520CI without sound and heating the power outputs.

    Sorry, this is an English only site.
  4. crutschow

    Magnetic field and how it is dangerous

    What makes you think magnetic fields, of such low intensity are dangerous? Even the huge magnetic fields they use in MRI machines are only dangerous if you have anything magnetic in you clothes, which can cause mechanical injury from the forceful movement of the object into you body.
  5. crutschow

    Bias_T and inductor resistance

    Of course they do, as they generate a constant-current through the resistance being measured and measure the resulting voltage to determine the resistance. How do you think digital meters measure resistance? They don't work as well to measure a capacitor, since the meter reading update is...
  6. crutschow

    Lithium Charging Load Resistance?

    The charging requirements from the data sheet: So your charger must be designed to limit the charge current (CC) to either of the above values and time, and limit the charge voltage (CV) to 3.6Vdc. The internal battery impedance does not have any affect on generating those charge...
  7. crutschow

    Lithium Charging Load Resistance?

    You never use the internal resistance of a battery to determine the charge current. The charger regulates the charge current to a safe value for the battery it is designed to charge.
  8. crutschow

    Need Help regarding the decade counter

    You just need one two-input AND for each FF with one of each of the inputs connected to each FF output. The other inputs of all the AND gates are all connected to the clock signal.
  9. crutschow

    Need Help regarding the decade counter

    You could use an AND gate connected to the clock and each of the FF outputs.
  10. crutschow

    Constant current circuit

    It's not necessarily. It is kept at a constant current independent of the coil resistance.
  11. crutschow

    Does anyone know the pneumatic equivalent of an electrical capacitor?

    For a two terminal capacitor analog it could be a chamber with a sealed flexible diaphragm across the middle, and two nozzles, one on each side of the diaphragm. Air going into one nozzle will flex the diaphragm and force air out the other nozzle. The more pressure, the more the diaphragm flexes...
  12. crutschow

    Is there any way to invert low voltage AC to higher voltage DC?

    You will find it quite difficult to get a useable amount of energy from a microphone, as the energy generated from a typical one is very tiny.
  13. crutschow

    BJT NPN + PNP to switch channel.

    Don't see how, as the PNP is connecting the speaker to Vcc. You could use two MOSFETs connected source-to-source in series with each speaker to act as a transmission gate. Example circuit below:
  14. crutschow

    Power suppy dilemma

    What is the current rating of the converter?
  15. crutschow

    Power suppy dilemma

    One of these should work.
  16. crutschow

    Linear Regulator Clarifications

    The fixed voltage versions have the resistors internally contained in the chip.
  17. crutschow

    Question about USB to TTL converter

    Can you use off-the -shelf converter modules or do you need to do it all from scratch?
  18. crutschow

    Oscilloscope and AC home line noises

    Likely because you are introducing an antenna from the battery and ground wire loop. So the problem is not your 'scope, it's the connections.
  19. crutschow

    LED strobe with fading effect possible with a NE555 ?

    So at what voltage does it operate properly?
  20. crutschow

    American 220 wall heater problem...

    Did you measure 220V between those two sources?
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