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  1. chagz

    How low does a notch filter go

    Is not an attenuation of 100dB the same as a gain of -100dB. For an input of 2V, a gain of -100dB would produce an output of 10uV. Instead, I get a 20mV noisy signal at my output. That is a gain of -40dB. The depth of the notch can be increased by closely matching resistors R1,R2 and R5 in the...
  2. chagz

    How low does a notch filter go

    I am in the process of testing out a wien bridge notch filter that i designed. The circuit simulation promised me a gain of -100dB at my chosen frequency. Which means that is almost zero output considering that I am to use about 2V at my input. The problem is that I have never before, until...
  3. chagz

    combination lock

    I understand that this is a very crude way of achieving the goal. I could have used a microprocessor with even better results. As it stands, I am a second year student at NUST, Zimbabwe. so this is a school project. The idea is to first make a working circuit using ICs, then translating the...
  4. chagz

    combination lock

    I am currently working on an electronic combination lock circuit that operates as follows: A user enters a four digit code that goes through a decimal-to-binary encoder. Because there are four input digits, it means that there are four identical comp[arator circuits. whenever an input is...
  5. chagz

    Improvements and Suggestions

    Suggestion I think it would be more convinient if a notification is sent to a thread starters email adress when it is replied
  6. chagz

    Which datasheet to use?

    I am trying to design a 2 stage BJT amplifier and I am having trouble choosing a spec sheet for the 2N2222A transistor which I am using. Normally, when i buy my parts, the spec sheet is not usually provided. So i decided to look for one on the internet using datasheetpro.com, the search engine...
  7. chagz

    BJT Transistors Question

    Try datasheetpro.com. It offers a few somewhat 'equivalent' parts. I think it's best if you'd try it for yourself.
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