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Jeopardy buzzer system helpview story

http://forum.allaboutcircuits.com – How would I make a circuit for 3 players for Jeopardy? (Embedded)

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Micro USB to RS232?view story

http://forum.allaboutcircuits.com – Hi, I'm building a pcb with a microcontroller on it that is programmable via RS232. I'm trying to construct a circuit to put on the pcb which will allow me to plug in a standard micro USB cable from the computer to a connector on my pcb, and then be able to program the microcontroller. I want to avoid a need for any special USB-to-TTL or USB-to-DB9 cables and external breakout boards, and ge (Embedded)

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Leds in parallelview story

http://forum.allaboutcircuits.com – Hi I'm new to electronics. I have a question. I need to connect 512 "PIXEL LEDs" (in parallel) Specifications for LED PIXEL are: http://www.aliexpress.com/item/1000p...25849.html?s=p. According to my calculations, I need a source of 20 A (actually 15.36 A). These LEDs are wired in parallel with a 2mm cable. There would be a problem? Supports those drivers these amps? (Embedded)

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Current Shunt Monitorview story

http://forum.allaboutcircuits.com – I got some samples from TI. I love those guys. :p The attached data Name is what I got. I like to clear a confusion regarding gain It is on the first page under Choice of Gains. I have INA199B3 : 200V/V & INA211 and 212 which has 500V/V and 1000V/V I was wondering what exactly it means. (Embedded)

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A question on count down alarm circuitview story

http://forum.allaboutcircuits.com – Hi, Just for my practice, I am trying to create simple gadgets using 74xx family chips. I am trying to make a simple count down timer that has the ability to trigger an alarm after x minutes. While setting the time, the 7 seg display shows only the minute and nothing else. For example, I can set the counter to 90 minutes and press start. (Embedded)

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Model of LM1893view story

http://forum.allaboutcircuits.com – hello, can you help me to find a model simulation of LM1893 component in Pspice? or method to simulate the schema that exists in the PSpice library Analog2 . thank you (Embedded)

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Revision help!view story

http://forum.allaboutcircuits.com – Hi guys, I have an exam coming up for my HNC electronics. I am ok with all of the topics apart from flip flops. I just cannot understand them. I have attached an example from a mock paper of what I need to do - the answer is shown on it to prove that i'm not trying to cheat. The problem is, even with the answer I just don't get it. (Embedded)

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Basic treadmill problem and need help?view story

http://forum.allaboutcircuits.com – Hi all, I noticed this forum has addressed problems with treadmill motors in the past so I thought I would post my issue and see if anyone can help. I know very little to nothing about circuits/electronics so bear with me. I have a NordicTrack C2300 treadmill that is about 10 years old but maintained well. (Embedded)

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100/-100V square wave generator from 170AC sourceview story

http://forum.allaboutcircuits.com – Hi all, The goal is to generate a +/- 100V square wave from a 120 VAC wall source. In addition, I need to be able to control the frequency and amplitude from a microcontroller. I'm currently using a half rectifier and capacitor circuit to create the +/- 100V and feeding that into a comparator op-amp and using a signal from my micro to switch the output. (Embedded)

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Quick quest. about Thevenin Vocview story

http://forum.allaboutcircuits.com – Im able to write up my equations using mesh analysis for Isc(Current short circuit) and my equations for Voc(voltage open circuit), but cant quite figure out the voltage across A,B for Voc. Would it be the voltage across the 4ohm resistor on top(I3) or the 6ohm resistor in (I1)? Problems posted below as Thev. Voc & Thev. (Embedded)