---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 10/09/22: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:44 PM - Current instrumentation for flight testing. (Robert L. Nuckolls, III) 2. 09:47 PM - Time delay on relay needed (rparigoris) ________________________________ Message 1 _____________________________________ Time: 06:44:13 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Current instrumentation for flight testing. Dan, Don't recall if I've sent you this suggestion yet so just in case . . . There'a a dirt-cheap line of hall effect current sensors you might consider for AC measurements on the alternator study. https://tinyurl.com/2gvhny4z These can be used for either AC or DC measurements. They feature a VCC/2 output for zero current. Hence, DC currents are resolved by subtracting 2.5V from output. For AC, you capacitively couple an AC voltmeter to the output. Use a TRUE RMS reading voltmeter . . . waveform of the AC current under light loads will be really wonky so an averaging meter would suffer considerable error. You can run a 'scope on the output along with the voltmeter. The output waveform will be a good representation of the signal in question. I used to have a few of these laying around but can't put my hands on 'em at the moment. May have left them on the last job. I like to keep some around 'cause they're so easy to use and the price is certainly right! Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ________________________________ Message 2 _____________________________________ Time: 09:47:55 PM PST US Subject: AeroElectric-List: Time delay on relay needed From: "rparigoris" Hi Group I am working on a project where an Arduino is completely unhappy if a 12 volt buzzer is connected to it's 10 amp relay. We tried an awful lot of things including installing another relay and even a separate battery to power the second relay and buzzer. the only thing that works is putting the buzzer on the Arduino relay if you wait one second. Then all is well. Question: Can someone point me to a 12 volt coil relay with a approx. 1 second time on delay that can handle 2 amps or more 12VDC? Or how can I delay the 12 volt relay i have from coming on for a second. Thx. Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=508044#508044 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.