Connect with us

Part substitution

Discussion in 'Electronic Basics' started by Randy Day, Feb 10, 2007.

  1. Randy Day

    Randy Day Guest

    I want to build this PWM circuit, and I have no
    100k pot. Can I substitute a 10k pot and a 1uf
    cap for timing, or are there other things I
    need to consider in this circuit?

    +V|--------+--------|
    |-----| |-| | |
    _v_ | .------. --- |
    -|___|- |-|3 4 8 | ---.1uf .-.
    | 100k | | | | | | 10k
    - V | 555 | === |_|
    ^ - +-|2 | GND |
    | | | | 7|-------------+-out
    +---+--+-+-|6 5 1|---
    | '------' |
    --- | ===
    ---.1uf | GND
    | ---
    === ---.01uf
    GND |
    ===
    GND
    (created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
     
  2. jasen

    jasen Guest

    yes, but doing so will increase the power consumed by the 555 circuit.
    Also you won't be able to get as close to 0% or 100% as with the 0.1uF
    capacitor
    Mainly the maximum rate that pin 3 can drive current into and out-of the
    capacitor.
     
  3. Randy Day

    Randy Day Guest

    Good points. Thanks.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-