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  1. C

    Anyone recommend me a book?

    You can download almost any book for FREE by simply looking on the web. I have hundreds of articles on theory and circuits on Talking Electronics website. Most books seem wonderful until you see my reviews and my attitude as to how a book should be presented. I have taught thousands of...
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    High and Low switching at the same Time

    The type of circuit you need is called a bridge circuit and there are hundreds of them on the web for transistors and MOSFETS.
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    Measuring room noise level

    I meant accurate calibration. Just use a $15.00 tester to provide some sort of reference.
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    Microcontroller Help!!

    The OP has not replied with any sort of coherent understanding that I tried to simplify the situation so I could get some sort of intelligent reply.
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    Microcontroller Help!!

    It sounds like you want to deliver a 1kHz signal and the micro outputs a 10kHz signal.
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    Regulated Power Supply

    You will only get 0v to about 12.5v
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    Measuring room noise level

    You don' need any accurate calibration because the alarm will sound when a sustained amplitude is recorded over a period of time. You can buy a dB instrument for $15.00 (posted) to provide a reference. The micro kit will cost another $20.00
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    Anybody know where I can get a collection of electrical symbols clip art

    You cant put a transistor directly across a battery.
  9. C

    Resistance of double sided adhesive conductive carbon tape

    The conductive foam tape I bought has channels of carbon from top to bottom and the resistance from one channel to the next is 500k.
  10. C

    Common Problems When Learning Electronics? Ideal Solutions?

    It is very hard to get recognized on the web and it will take you years to get a following. On top of this, very few readers are prepared to reply. Take for example, Everyday Practical Electronics blog. The magazine has been in existence for 50 years and they have barely 11,000 readers and get...
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    FASTEST FINGER FIRST

    That's exactly what I am saying.
  12. C

    FASTEST FINGER FIRST

    The 3-terminal regulators are so badly designed that they can produce their own noise (1MHz etc) and draw excess current, even when the load is small. That's why the capacitors have to be positioned very close to the leads. It's nothing to do with noise from external circuitry.
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    FASTEST FINGER FIRST

    "much smaller capacitors are placed as close to possible to certain ICs to help filter out any noise that may be present on the power traces." Capacitors are needed, not to reduce noise on the supply rails but to reduce noise produced by the 3-terminal regulator itself. That's why they are...
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    Will my circuit work? (trying to make a who pressed first quiz buzzer)

    Here is the simplest circuit
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    FASTEST FINGER FIRST

    Here is the simplest circuit
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    Will my circuit work? (trying to make a who pressed first quiz buzzer)

    You can make a much simpler circuit.
  17. C

    impedance of amplifier

    "why we are calling common collector configuration as impedance matching network" There are three uses for an amplifier. To increase the voltage (the amplitude of the voltage) To increase the current. To increase both the voltage and current. Since a common collector configuration does...
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    HT1030 Voltage Regulator

    Get 5 of them from eBay for $1.00 with express postage to your door via courier: 5pcs HT7130-1 7130-1 3V 30mA Low Dropout Voltage Regulator IC LDO SOT-89...
  19. C

    Microcontroller and Stepper motor.

    The best is to start with a $5.00 stepper motor and driver from eBay. I have a program to drive a uni-polar stepper motor as it does not require "phase-reversal" or a bridge. Once you get an understanding how to drive this type of motor from a microcontroller or set of discrete chips, you can go...
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    Joule Thief

    Measure the current. Now put a 10n between the join of the transformer and the 1k and the negative of the battery and measure the current. Then try 30 turns and 30 turns without the ferrite and see it will work just as well.
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