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Using an AVR to monitor LIPO minimum voltage
I am now using LIPO batteries for my LED designs. I have a 1 amp PTC fuse with a battery monitor (tiny13). My initial design used the BOD fuse set at 2.7VDC and I powered the Uc...
Saturday, 10 March 2012 - 14:44
Why only 2.3 mA what's the point? Opto-Interrupter
I bought a bunch of these Opto interruptors for my CNC machine. I looked at the initial rating of 20mA as the current this little guy could pull down. http://www.mpja.com/download...
Wednesday, 8 February 2012 - 01:04
Need some help with noise on Home and Limit switches for CNC
I have converted an old NC mill to full CNC by adding a quill drive. I am using gecko drivers and an 72VDC power supply. I am having a problem with the home and limit switch wires...
Friday, 3 February 2012 - 08:37
Chopper circuit for steppers
I have designed this chopper circuit. I used a bootstrap circuit using an avr PWM to boost the voltage for driving an NPN mosfet on the high side. I have on order the IRS2186...
Tuesday, 22 November 2011 - 21:59
Measuring ohms on a stepper motor
I just bought an old excello mill that has slo-syn stepper motors. rated at 1.3V 20 amps. Typically you can measure ohms on the coil to determine the center tap however measuring...
Wednesday, 9 November 2011 - 17:41
Hall Effect Sensor 2.2 - 2.8V Quiescent Current
I am using the A1301KUA-T IC Hall effect Sensor. It operates at 5V dc and outputs 2.2 - 2.8 VDC as a Quiescent current. I will be using the magnetic pole that drops that voltage...
Friday, 16 September 2011 - 00:48
GPS sniffer any ideas?
I received a call from a friend that wanted to know if there was a detector available to sniff out a GPS that may be located in a car. I would think if there is no transmission...
Wednesday, 10 August 2011 - 00:19
Using an H-Bridge to switch 4 LED's
I am using Cree RGBW LED's 700ma per die in a project. I have a question on the voltage necessary to fully turn on the top two mosfets in the chip. Using the ZXMHN6A07T8TA 5VDC...
Saturday, 23 July 2011 - 15:28
Understanding 2 speed AC motor
This last winter my hot tub had to be drained as it blew a fuse and froze up the lines. Spring is here and I am rummaging through some old motors I have removed from other hot...
Monday, 18 April 2011 - 02:00
115V/220 motor wont start but runs fine if I give it a push
I bought this motor from surpluscenter. It is not used but I don't know when it was made. http://www.surpluscenter.com/ite... I connected it up and it just stalls when applying...
Sunday, 6 February 2011 - 07:40
Codevision Codewizard read_adc function Where is it?
I am setting up a 120 volt sequencing program to switch between 3 2000 watt heaters on one 20 amp circuit. I am using an allegromicro hall effect device that will generate a 60...
Wednesday, 26 January 2011 - 05:30
Calculating the Rt for a 1:100 20 Amp Current Sense Trans..
Hi, I am setting up an Aluminum anodizing line and I have three 20 amp heaters and one 20 amp circuit available. I tested the on time vs off time for one of the tanks and it only...
Monday, 24 January 2011 - 02:30

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