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batteries getting hot  from All About Circuits Forum  (2010/3/10 13:26)

hello i build an electronic circuit and i connected it to a switch with a 4 AA battery pack now all good but when i turn off the switch after few min the battry pack is hot as fire.. i tried to connect a capacitor but it didnt help... any ideas ?

PING))) #28015 with PIC18F2550  from All About Circuits Forum  (2010/3/10 12:56)

Hey Everybody! Im doing a circuit that must measure constantly the Level inside a Tank, i.ve done the circuit and it works! but after a couple of minutes the Sensor and PIC stops working and just turning it off and on again makes it work for another couple more minutes....i dont know if its the code or what, but how can i fix it!!.... the circuit flow sequence is as follows: 1) System iniciated 2) Start the PING))) #28015 3) If the level in Tank is = to low level, Turn on the Pump 4) If the level in Tank is < than Low Level, Turn on the pump, turn on the Alarm 5) If the Level in tank is = to High Level, Turn off the Pump 6) If the level in tank is > of high level, turn off the pump, turn on the Alarm That must be Cyclic!, and constantly show the Level in an LCD.... Here i`ll put you the code: Code: #include <18F2550.h> #device adc=10 #fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN #use delay(clock=48000000) &nbsp;#define USB_CON_SENS ...

Charging Circuit  from All About Circuits Forum  (2010/3/10 12:56)

I am building a project that required that a 12v battery be used to power a motor. The problem is that I want to apply 12v to move an object but want the object to return to original position upon removing the power. The motor is a electric window motor for a car which I assume draws about 2-3 amps. I can find that out for sure,,, but you get the idea, I'm sure. Thanks.

Connection of: AND logic gate, NE555, Microcontroller  from All About Circuits Forum  (2010/3/10 12:20)

I want to make an AND logic gate that takes as the two inputs: 1) Impulsions from a microcontroller 2) High frequency signal from a NE555 How do I go about doing it? I would like to know in what form the microcontroller gives impulsions to the logic gate (which I plan to make with either 2 transistors or 2 diods; which is better?). I would also like to know in what form the NE555 gives its high frequency signal to the logic gate. I think that would help me connect these components together. What comes after these components is a sort of voltage amplifier (which I plan to make with 1 transistor, 3 resistors and 1 capacitor; is that a good idea?) and after this voltage amplifier is a transformer to isolate the microcontroller from the triac that comes after the transformer. Finally, the project is actually to regulate the power given to a heating element and the triac is the component that regulates the power that the heating element receives. Thank you in advance for helping me ...

Multimeter question - 3.5mm jacks  from All About Circuits Forum  (2010/3/10 12:11)

I've never owned or used a multimeter before and was wondering if I need to buy an adapter of sorts to measure voltage coming from a 3.5mm (1/8") patch cable. The voltages are coming from my modular synthesizer. Thanks and apologies for the novice question.

AND logic gate is better: with 2 transistors or with 2 diodes?  from All About Circuits Forum  (2010/3/10 12:03)

I want to make an AND logic gate that takes as the two inputs: 1) Impulsions from a microcontroller

Sensor failures  from All About Circuits Forum  (2010/3/10 11:29)

Dear all,,, What are the failure causes of the following: 1- Voltage sensors. 2- Current sensors of current transducers how can the fault be detected in both types?.

KVL: Mesh Current Method  from All About Circuits Forum  (2010/3/10 11:22)

Im using the Mesh Current Method to find the voltage across R2 (5k). I dont know how to write the equation for Loop 3. I tried removing Loop 3 from the circuit then calculating the currents for loop 1 and loop 2, then putting back loop 3 (6 mA) back into the circuit - that didnt work. Attached Images KVL Mesh.jpg (191.6 KB)

K-map simplification  from All About Circuits Forum  (2010/3/10 11:14)

Suggest me how can i solve the following K-map f(A,B,C)= Σm(0,1,3,A,5)

Power Supply for RF Modulator  from All About Circuits Forum  (2010/3/10 11:12)

Hi I need a power supply for my project. I intend to take the plug off the the phone charger but I have no multimeter to know which line is positive. One of the two wires have a white stripe running on top of it. Would that be the positive?