Ambient Light sensor using an Op-Amp Comparator
#op-amp
#comparator
#light sensor
#ambient light
#photoresistor
#voltage divider
#analog circuit
#sensitivity control
#output trigger
#environment sensing
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Universal-mixer-stage
This circuit illustrates various possible buffer combinations. These include a differential input stage, a voltage follower, as well as both non-inverting and inverting stages. The allowable resistor ratios and recommended device types are also included. One restriction applies to this...
IC4030-4031 Typical Operating Circuit Schematic and Datasheet
The diagram below illustrates a typical operating circuit for the video line driver using the IC4030/4031 schematic. It incorporates the MAX4030E/MAX4031E, which are unity-gain stable operational amplifiers that offer high-speed performance, rail-to-rail outputs, and 15kV ESD protection, as stated in...
Light to Frequency Converter TSL220
A large area photodiode and current-to-frequency converter integrated into a clear plastic 8-pin DIL package. The output generates a pulse train whose frequency is directly proportional to the light intensity. It is CMOS compatible (a 3.3kΩ pulldown resistor is recommended...
Low-light-level-drop-detector
This self-biasing configuration is useful whenever small changes in light level must be detected, such as when monitoring very low flow rates by counting drops of fluid. In this bias method, the photodarlington is bias stabilized by feedback from the...
AD Design
The right leg driver circuit is where many amplifier board circuits' common signals are summed and inverted through the Right Leg Driver circuit and sent back to the body to cancel out common voltages. This ground point could be an...
Inverting-programmable-gain-amplifier
This circuit can be programmed for a gain of 0, -1, -2, -4, or -8. This could also be accomplished with one input resistor and one feedback resistor per channel in the conventional manner, but this would require eight resistors...
Multiple-feedback bandpass filter
The operational amplifier (op amp) is configured in inverting mode. Resistor R3 connects the output to the inverting input, establishing the gain and the current through the frequency-determining capacitor, C1. Capacitor C2 provides feedback from the output to the junction...
op amp Find Vo in an op-amp transistor circuit
The voltage measured at 12V after the emitter is perplexing, especially when the output from the op-amp is +15V, suggesting a 3V drop across the transistor. This raises questions about the expected gain of 2, which would imply an output...
High sensitivity alarm
The simplified block diagram of a high-sensitivity alarm circuit features a photoresistor (LDR) and three ordinary resistors connected in a specific configuration. When transitioning from complete darkness to full light, the potential at point X varies between approximately 1/4 and...