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From: Jan-Hinnerk Reichert
Subject: Re: Electronic On-Off Switch Using Thyristor?
Date: Mon, 02 Sep 2002 15:11:09 +0200
NNTP-Posting-Host: b076138.adsl.hansenet.de (22.214.171.124)
Geraldo Sazias wrote:
> You misunderstand me. The Play button IS the "power-on" button (there is
> no seperate power button) whilst the Stop button is the "power-off" button
> (in my case it's controlled by the MCU).
> Below is a description of the operation of the circuit I had in mind.
> In the power-off state, no power flows should flow through any component
> (to minimize power consumption), thefore a flip-flop cannot be used since
> it needs power to react to the inputs. When the Play button is pressed, a
> current flows for the duration of the keypress which turns on the
> thryristor (or some other component) which in turn allows current to flow
> to all IC's of the player, thereby turning it on. The MCU controls a
> seperate transistor which will turn off al current to the thryristor
> thereby resetting it.
> I could, off course, designed it such that the MCU is always powered but
> asleep awaiting a key press of the Play button and subsequently turning on
> a transistor which would power all the other IC's and electronics but I
> would prefer a solution which draws no current at all in the 'off' state.
There is no such thing as no power consumption. Even if you take the
batteries out they are still consuming power.
If you have 500mAh accu (not state of the art) and 1uA current, the accu
would last over 100 years (if it wasn't for the accu ;-)
> The ELM MP3 player has a nice circuit with the function described based on
> transistors (http://elm-chan.org/works/mpc/mpc_c1.png) but I'm wondering
> if there's an even simpler solution.
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