Path: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!weretis.net!feeder8.news.weretis.net!reader5.news.weretis.net!news.solani.org!.POSTED!not-for-mail
From: Jeff Layman <jeff@invalid.invalid>
Newsgroups: uk.d-i-y,sci.electronics.design
Subject: Re: Current consumption of LCD kitchen timer?
Date: Sat, 10 May 2025 15:31:42 +0100
Message-ID: <vvno0e$fone$1@solani.org>
References: <XnsB2DB94CDD19321F3QA2@135.181.20.170>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
Injection-Date: Sat, 10 May 2025 14:31:42 -0000 (UTC)
Injection-Info: solani.org;
	logging-data="516846"; mail-complaints-to="abuse@news.solani.org"
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:te9wZcwzUavq4hO9MxFP814BI6g=
In-Reply-To: <XnsB2DB94CDD19321F3QA2@135.181.20.170>
Content-Language: en-GB
X-User-ID: eJwVysERwDAIA7CVAsZOOk7D4f1H6FVvEQr1LlFF09kY39zPGswoEHZXZV+fvMbfY00kyKM3PyNHEMM=

On 10/05/2025 14:37, Pamela wrote:
> I'm interested to know the current drawn by a kitchen LCD digital
> timer.
> 
> (1) How much current does the timer draw when counting time?
> 
> (2) How much current is drawn when the piezo buzzer is sounding?
> (Averaging out beeps and silent bits.)
> 
> My guesses are 2mA and 25mA, respectively. Is that about right?

At least 100x too high for the basic clock consumption. According to
<http://www.technoblogy.com/show?19K8>, the average power consumption is 
about 10µA. It would depend on the clock processor, display and driver, 
etc, but a few microamps would be typical. It could be even lower - I 
once had an LCD clock (not a timer) I forgot I had and found it in a 
drawer still displaying after 20 years (surprisingly with a Toshiba zinc 
carbon AA battery powering it. From what I remember, the battery 
voltage, measured with a digital voltmeter, was less than 1V!).

> I mean a timer similar to this one, running off a 1.5V battery.
> https://www.amazon.com/Digital-Kitchen-Timer/dp/B00GOPICNM

-- 
Jeff