.. and amounts to 60 s. If desired, it is easy to check by connecting the upper Rt pin according to the scheme to the positive supply rail. The stronger the heating, the earlier the circuit turns it off, while maintaining the set tip ...
.. quickly check a cable of twisted-pair wires for short circuits, open circuits, and pair-to-pair shorts. A battery or a dc supply delivers 15 to 24 V to the test set. The voltage regulator (IC 1 ) is connected as a current regulator to ...
.. down the full voltage of the module so that the output at V PV , after a closed-loop gain of 5 V/V, is within the 5 V supply rail. R1 and R2 can be adjusted to divide down any module open-circuit voltage (V OC ), as long as they do ...
.. anywhere from 3 to 20 V (or more, if Q1 is suitably rated), individual parts or functions may not. Typical values are: Supply R2 R4 3 V 0R 100k 6 V 0R 330k 12 V 100k 680k 20 V 300k 1M0 R2 ensures that Q1’s gate-source voltage is ...
.. that Q 3 is biased off, which allows Q 1 and Q 2 to slowly charge C 1 through the constant-current action. The power-supply current draw of the gate increases somewhat as its input voltage pulls away from the 5 V rail. When the C 1 ...
.. one (Figure 1). Many loads are insensitive to driving voltage, so it would be a waste of money and power to use a regulated supply to drive the FET. It is also common practice to add resistors R 1 and R 2 to the comparator to put hysteresis ...
.. outputs a current of 0.5 mA per amp of load current flowing through its internal sense resistor while rejecting common-mode supply-voltage noise. The on-chip sense resistor handles as much as 3 A of continuous current. The IC accommodates ...
.. than commercially available VFCs (e.g., the 4-MHz VFC110) while conveniently running on less than 10 mA from a single +5-V supply/reference. Figure 1. Take-back half (TBH) charge pump gives simple VFC reasonable performance at 20 MHz. What ...
.. damping of the meter movement. For example, suppose that your application requires measurement of a 0 to 10 V power supply (Figure 1). You have available a typical electromechanical meter that presents a full-scale voltage rating, V ...
.. generated. In another position, an “OFF” delay is generated. The load can be connected between Q1 and the power supply (across LED + R6), which can be switched “ON” or “OFF” after the time delay. U1 (555) ...