Simple O2 meter with LM3915
#LM3915
#oxygen sensor
#measurement
#display driver
#analog circuit
#sensor interface
#voltage indicator
#gas detection
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lm 3915 sound level meter circuit
This is a single-chip sound level meter that can be used to display the sound level of an amplifier or simply the sound level from a microphone. The core component of the circuit is the IC LM3915 Audio Level IC....
Analog circuit enforces slow servo response
The all-analog circuit presented controls the rate at which a miniature turbojet engine can be throttled. Increasing or decreasing the throttle too quickly on a miniature turbojet engine, or any jet engine, can lead to quick failure in flight, causing...
3.6 Volt cell phone battery meter circuit
This circuit functions similarly to the previous one and features a 4 LED bar graph that displays the voltage of a common 3.6-volt lithium-ion rechargeable cell phone battery. The reference voltage is supplied by a TL431 programmable voltage source, which...
Cell Phone Battery Meter 3.6 Volt
This circuit is designed to provide a 4 LED bar graph that indicates the voltage of a common 3.6-volt Lithium-Ion rechargeable cell phone battery. The reference voltage is supplied by a TL431 programmable voltage source, which is configured to 3.9...
RealView 2.0
RealView is a measurement application, which records and plots measured values from analogue hardware devices in real-time. Several curves can be plotted into a single diagram. Several diagrams can be arranged on one or more pages if necessary. Plot options...
VOICE LEVEL METER
The LM3915 is a VU meter LED bar graph driver that can control 10 LEDs. It operates in conjunction with a simple audio amplifier that drives a detector circuit, providing the necessary DC drive for the LM3915.
The LM3915 IC is...
Undervoltage-overvoltage indicator
This circuit will activate the LED when the monitored voltage drops below the values determined by the Zener diodes D1 and D2.
The circuit utilizes Zener diodes to establish reference voltage levels, which are critical for monitoring voltage thresholds. The Zener...
o2 sensor
The oxygen sensor simulator is constructed on a protoboard. It utilizes a cigarette lighter plug as the power source. An adjustment knob is located on the left side, while a switch is positioned on the right. A red indicator LED...
Maximum Minimum Voltage Indicator
This circuit indicates which of three voltages, ranging from approximately -4V to +4V at points A, B, and C, is the highest by illuminating one of three indicator LEDs. It can also be configured to indicate the lowest of the...