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op amp Why does this current limiter circuit oscillate – Circuit Schematic
op amp Why does this current limiter circuit oscillate
Make a 0-25 mA current limiter. I want to take a control voltage of 0-5 V as input and have it control a current of 0-25 mA through a restive load (the restive ...
led Problem with microphone powering up a comparator circuit – Circuit Schematic
led Problem with microphone powering up a comparator circuit
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op amp A probably very easy Op-Amp Analysis – Circuit Schematic
op amp A probably very easy Op-Amp Analysis
I`ve been getting that V_A = 15 (which is wrong). Also I think V+ is = 0 since the node below 3 ohm is grounded. Any help on how to start solving this Ok! So, w...
op amp Flow of current in a simple inverting amplifier circuit – Circuit Schematic
op amp Flow of current in a simple inverting amplifier circuit
Considering a simple circuit like the one below. Let us say that the voltage source suddenly turns on (from 0V to 1V), then current will through through the res...
op amp Find Vo in an op-amp transistor circuit – Circuit Schematic
op amp Find Vo in an op-amp transistor circuit
WHY is the voltage at 12V after the emitter If it`s coming out of the op amp at +15V, then that would put a 3volt drop across the transistor. and why isn`t the ...
op amp What does this circuit do? Op-amp with transistors in feedback – Circuit Schematic
op amp What does this circuit do? Op-amp with transistors in feedback
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capacitor Finding RC output voltage to a sine input – Circuit Schematic
capacitor Finding RC output voltage to a sine input
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op amp Op amp analysis question – Circuit Schematic
op amp Op amp analysis question
The circuit was reverse engineered from an old equipment. The op amp stage seems to me like a comparator/oscillator, it is comparing $V_0$ which varies over tim...
op amp Generating sawtooth signal out of square/triangular signal – Circuit Schematic
op amp Generating sawtooth signal out of square/triangular signal
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op amp Humming and Transmission issues – Circuit Schematic
op amp Humming and Transmission issues
When connection to PC speaker is plugged in and Telephone connection(bottom-left) is plugged in, I hear humming in the headphones. When only one is plugged in I...
capacitor values for non inverting op amp circuit – Circuit Schematic
capacitor values for non inverting op amp circuit
All the capacitors are there to just block DC, but how important are the capacitance values and how does one determine the value of Co. Rin represents the sourc...
op amp Why the resistor in this op-amp circuit – Circuit Schematic
op amp Why the resistor in this op-amp circuit
Here`s a circuit diagram for a signal response test circuit from the spec sheet for a HA-5195 op amp and looks like a non-inverting amplifier circuit with a gai...
op amp ringer circuit old telephone – Circuit Schematic
op amp ringer circuit old telephone
In the process of adapting an old phone to be used as an Bluetooth phone. I am currently testing the ringer circuit, which I build using the schematics provided...
op amp Amplifying signal from CO2 Sensor – Circuit Schematic
op amp Amplifying signal from CO2 Sensor
Amplify a MG811 CO2 sensor to a range readable by an ATMEGA2560 (0-5v). I have other analog sensors, so do not want to change ref voltage on Atmega. I have foun...
Current to voltage converter proofing – Circuit Schematic
Current to voltage converter proofing
At a T connection, it`s clear, but at a cross it`s otherwise not clear, especially if there are no junction dots elsewhere as in your schematic. It looks like t...
op amp Why do some of my IE converter circuits have a large offset voltage – Circuit Schematic
op amp Why do some of my IE converter circuits have a large offset voltage
The inverting input is held low through a 10K resistor when the circuit is powered on but not being used. Whenever a measurement is being made (including calibr...
op amp What is the advantage of the inverting opamp circuit over non-inverting one – Circuit Schematic
op amp What is the advantage of the inverting opamp circuit over non-inverting one
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adc Voltage Fluctuations in Arduino-opamp-thermistor circuit – Circuit Schematic
adc Voltage Fluctuations in Arduino-opamp-thermistor circuit
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op amp Basic Frequency Control Circuit – Circuit Schematic
op amp Basic Frequency Control Circuit
R4 prevent the output voltage drifting towards one of the supply rails to the op amp I understand that R4 has to have a high resistance but I do not know why Th...
op amp IR Demodulator Design – Circuit Schematic
op amp IR Demodulator Design
Designing an IR demodulator circuit to replace the one shown in this question. Basically I want to demodulate a simple IR signal modulated at 32. 678 kHz. I jus...