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Results tagged with voltage
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user 41003
Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).
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circuit help, voltage doubler
The 741 is a very old amplifier and needs the power supply to be at least 3V beyond the required output voltage. …
- 34.2k
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5V Voltage Regulator - Bypass when 5V
The most straightforward is to replace the AM1117 with an LDO with a very low drop out voltage.
They can have 50-100mV of voltage drop when the input is below the voltage required to regulate. …
- 34.2k
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Convert 0-5V from DAC into +/-5V?
An opamp can do that and you will need to arrange your software to drive the DAC appropriately.
Here is a TI application note that applies to this. It has the equations to modify the resistor values …
- 34.2k
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Window comparator using LM339 - invert output
Put the LED between the combined output and ground and put the resistor directly to 12V.
When either of the comparators turns on it will short the output to ground and turn off the LED.
The function …
- 34.2k
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What type of voltage booster circuit is this?
When the output voltage reaches the set point (12v), zener diode ZD101 starts conducting causing TR107 to divert base current from TR106 and either stop or reduce the level of oscillation. …
- 34.2k
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Broad VF range of LED... 5-9V?
You shouldn't drive an LED with a voltage source. … You need to use a current source at up to 150mA
A resistor from a voltage significantly higher than the LED voltage is usually acceptable for low power applications although the current won't be as well …
- 34.2k
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DC-DC converter outputing wrong voltage
This type of converter requires a minimum load as the output is not regulated and at low output currents (such as no-load) the output voltage can rise. … The output voltage will be approximately proportional to the input voltage.
Their advantage is a low cost, small size and low heat dissipation. …
- 34.2k
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Voltage regulator identification?
it looks to me like a Motorola thyristor produced in the ninth week of 1985. The K A G refer to the Cathode (K), anode (A) and Gate(G) pins.
The number is possibly a house number rather than a publi …
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Unknown voltage in IR pulse sensor circuit
There are multiple design problems with the circuit
1) There is no DC feedback from the output of OA1 to it's negative input. After a few seconds it will saturate and stop working.
2) The output ci …
- 34.2k
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How much more efficient is 240 V than 120 V?
Some reasons are because of the higher voltage others because of the higher power available from a 240V source. 120V sources are usually limited to about 1.4kW (120V @ 12A) where 240V sources can commonly … of the input voltage.
2: The various active control modules, fans, circulation pumps etc in the vehicle take the same power whether charging at 120V or 240V. …
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Do you really need to use the specified voltage to drive a transistor?
The emitter-base voltage of 6V is the Maximum rating. Go beyond that and it will destroy the device. It is NOT the normal operating voltage. That entire section is the ratings to avoid destruction. … Also, although the data-sheet is vague on the point, the emitter-base voltage of 6V is the maximum reverse voltage (ie with the base negative with respect to the emitter). …
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Why does this circuit need two voltage sources?
It probably also checks for failure conditions by measuring the voltage at the collector. It may also regulate the base current depending upon the collector voltage. …
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± usage and absolute sign ambiguity
You are almost right.
One other very important characteristic is the common-mode range: In conventional opamps this must not get closer to the supply rails that ~2V. For the NE5532 it is shown as bel …
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Need to produce regulated 5V from a source that ranges 3.7 - 6VDC
One approach I have used in a similar case is to use a boost converter to convert the input voltage to a voltage slightly higher than the output voltage. For example 6V in your case. … Then follow that with an LDO to drop the voltage to the 5V output voltage. …
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