All Questions
7
questions
1
vote
2
answers
81
views
Regulated Power Supply
I am supposed to simulate this circuit (regulated power supply 5V), however I am not understanding what's the point of the resistor R. Is it a load resistor? Cause i thought these needed to be before ...
0
votes
0
answers
32
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Voltage drop on system activation
My question is generic in nature about electronics system design. I am trying to put together an RC car which is powered by an AVR Atmega168 chip. It communicates through an HC-12 module and has a ...
- 313
-2
votes
1
answer
989
views
7805 Voltage Regulator powering astable 555 Timer yields LOW voltage as input to timer circuit
Hello stack exchange,
So, I have two batteries powering a circuit and I want to only use one. 12.7V comes from a lead acid battery, and the smaller one is a stack of 4xAA that yield around 6.4V. The ~...
- 1
0
votes
1
answer
80
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Circuits And Voltage [closed]
simulate this circuit – Schematic created using CircuitLab
Please help.... I have an input of 7.5V but when it goes out of the circuit the voltage drops in 2.5V but i want 5V of output voltage ...
0
votes
2
answers
137
views
Portable phone/device charger
I am doing my best to make a portable charger.
Here is the link with the schematic of the circuit I am working on:Voltage regulator question
.I was told that the 9 V battery I was using didn't have ...
- 1,418
0
votes
1
answer
81
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Large voltage/amperage battery issues
I have purchased this lithium polymer battery (11.1V, 5500mAh), to power a robotics project. The project uses a Raspberry Pi, three continuous-rotation servo motors, a couple of LEDs and a Sparkfun ...
- 177
0
votes
2
answers
633
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L7805CV won't go higher than 7.5
I am trying to use a STMicroelectronics L7805CV to increase voltage from 7.5v to about 12v, but I can't get it work. I've placed 470 ohm resistors between out and common and between common and ground, ...
