Archive for the ‘Control and Monitoring’ Category
Strobed Supply Improves Strain Gauge Bridge Efficiency
The following schematic diagram shows a method to reduce power consumption without sacrificing the bridge signal output level of a strain gauge. Many situation will be applicable for this strain gauge bridge signal conditioning circuit, where continuous output is not a must. In the long time frame, this circuit will in idle state for almost …[Read More]
Tachometer Circuit with Single Transistor
A schematic diagram of simple tachometer circuit is shown below. Using only a single transistor as the active component, this tachometer would probably be the simplest one. The input of this circuit can be picked up from ignition pickup coil, or other wiring that gives ignition wave-form. This tachometer circuit works for 0 to 6,000 …[Read More]
This is a relay circuit that detect the presence of sound to activate the relay. You can use this sound-controlled relay as voice operated switch, light control, toys, or any other application that can be controlled by a switch. Just replace the switch with this relay and now you have a sound-controlled device. This circuit …[Read More]
Logic Power Control for 78xx Regulator
Logic power control of analog regulator can be useful in application where a digital circuit/controller need to control power source, such as in EEPROM programmer or other power controls. This is a circuit provide ON-OFF control for 78xx regulator using digital (TTL or CMOS) signal level. This circuit uses transistors in series with the 78XX …[Read More]
Touch Switch Monostable/Timer with 555 IC
A schematic diagram of a touch switch circuit is shown below. This circuit consist of timer, one shoot multivibrator and touch terminal. As timer, this circuit uses 555 timer which is connected to one-shot multivibrator. The touch terminal is used to trigger this circuit. The output of this circuit can be used to drive a …[Read More]
2 Phase and 3 Phase Motor Drivers
The schematic diagram below show 2-phase and 3-phase motor driver circuits. This circuit can used to drive an AC motor because this circuit has an integrated power operational amplifier, built-in power-output stage and high amplification factor. The needed AC signal is produced by the op amp that is configured as oscillator. The motor is driven …[Read More]
LM10 Battery Voltage Threshold Indicator
A battery threshold indicator circuit shown in the schematic diagram below has current regulation mechanism in driving the LED. A sufficient current should be satisfied at the minimum voltage but no excessive current when the voltage is at the highest level. Balance pin (5) is used as the reference voltage for regulating the current. This …[Read More]
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