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Capacitor on line with high frequency digital signal?
Capacitors act as a short for high frequency signals. If I place a capacitor on a digital 5V PWM line or perhaps a motor encoder line does the cap still act as a short to ground for the square wave...
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What do you mean by -3db cut off frequency in low-pass-filters?
I have a low pass filter as follows. simulate this circuit – Schematic created using CircuitLab Using voltage divider I get $$frac{V_{out}}{V_{in}} = frac{1}{sqrt{1+(omega RC)^2}} $$ But now I got a...
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Can a 5V regulator connect directly to a voltage divider to obtain a 2V output?
In my circuit, a lm78l05 is used to provide +5V voltage to other parts. And now I need another +2V source to shift my input signal from +-2V to 0~4V as the ADC ad7682 limits the input signal range from...
View ArticleConnecting RaspberryPi & Leonardo-voltage divider needed?
According to this article when connecting a RPi to a Uno a voltage divider is needed because of the voltage difference. Does the same apply to a RPi and Leonardo?
View ArticleLow power serial bluetooth module with Arduino
I plan to use the HC-06 serial bluetooth module with an Arduino Leonardo. To my knowledge, the Arduino’s serial pins output at 5V with 40mA of current. The HC-06′s datasheet says it will accept input...
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Tuning LED circuit so LED turns on at specific voltage
I am attempting to add a signal activity LED to my dummy load box. I have constructed the following circuit and so far it does what it is supposed to (lights an LED with signal applied and does not...
View ArticleHow to reduce maximum power rating of dishwasher for use with photovoltaics...
I have a photovoltaic power system and an inverter with an overall power rating of 1500 Watts. I want to connect a dishwasher which consumes 2200 Watts when heating the water. Question: What is the...
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Stiff Voltage Divider Bias for an Emitter Follower
Below is an ac-coupled emitter follower with base bias provided by a voltage divider. I’m having a slight issue with how the resistor values are chosen for the biasing in the design example provided in...
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Solar power monitoring with Raspberry Pi
I want to measure the current and voltage from a set of small solar panels (about 10V and 100mA but not settled yet) using a Raspberry Pi. There will be between 4 and 6 panels. This project will need...
View ArticleWriting to SD Card cheaply
So, here’s the scenario: I have an Arduino and an SD card. Unfortunately, I don’t have one of the fancy shields, and I don’t have the time to order one. As we know, Arduinos run on 5V, and SD cards run...
View ArticleResistors in series or one after?
I want to use a Voltage divider and i need to divide 5v to ~3.3 so I ordered 10K resistors on eBay, but the voltage divider needs a 20K and a 10K, can i use 2 10K’s parralel as a 20K
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How to connect a jack lead to the input of a 741 circuit
Below is a diagram of a 741 circuit with a microphone attached, I’ve built the circuit and it works reasonably well. However is it possible to connect a jack lead to the circuit instead of a...
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Can a simple voltage divider circuit be used to accurately measure voltage?
I have a discharger circuit that I intend to hook up to a 3V battery. Total resistance of the circuit (depending on how fast I intend to discharge it) will vary from 0.04 to 0.01 Ohms (that’s 75A and...
View ArticleIs interfacing the 5V TTL UART with 3.3V microcontroller via voltage divider...
I need to connect my MSP430 microcontroller (3.3V) to interact with a 5V TTL UART camera (http://www.cn-lcf.net/sdp/561974/4/pd-2909996/7575433-2127043/LCF-23M_OV528_Protocol_RS232_Camera_Module.html)....
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Regarding the design of a basic voltage divider
I’ve just entered the fabulous world of circuitry and was wondering about the design of voltage dividers. I understand their function and formula quit well, but was wondering about the actual structure...
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Scaling 12V PWM signal to 0-10V
I’m trying to translate a 3.3v PWM signal through an optocoupler to the 12V side of a circuit, filter it to obtain a relatively clear DC voltage, and scale that to 0-10V for a control element. So far,...
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Transfer function of an op amp circuit
Let’s suppose the following circuit: I am trying to find a relation between Vs, V1 and V2 at this circuit. Please note that Vs is measured in relation to the ground. I have declared some extra points...
View ArticleCapacitors Not Charging Uniformly
I have 2 identical PowerStor Series XB supercaps connected in series. Voltage rating of each is 2.5V. In series their capacitance is cut in half but the voltage drop over both of them should be double....
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What is the function of voltage divider in the below circuit?
Hello I am a beginner in electronics and eager to expand my knowledge in it. Earlier I was trying to build an Ultrasonic receiver using a transducer and some op amps. I ran searches in the Internet and...
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Voltage shift from 5V to 3.3V
I’d like to use MX-05V 433MHz receiver together with a Raspberry Pi. The MX-05V operates on 5V, but the Raspberry Pi’s inputs only allow 3.3V. So i need to shift the RX data output level from 5V to...
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