.. to bulkier ON/OFF switches for DC circuits. The circuit has a fairly simple explanation. U1 is a counter. During power on, R2/C2 resets the counter to zero. When you push PB momentarily once, a pulse is generated and shaped by a ...
.. current source of: It also illustrates how adding a booster transistor Q1 can accommodate applications needing current or power beyond Z1’s modest limits. Notice that Z1’s accuracy will be unimpaired because, with whatever ...
.. 1B is which makes V LED = V B 2.5 V. The values of R 6 , R 7 , and R 8 are such that V B limits at the positive or negative power-supply rail when V PROBE is at the logic family’s minimum low or high level, respectively. Figure 2 shows ...
.. reverse bias of the load; some loads might not tolerate this. The 1N4001s block that, and also provide bias for the power-down cutoff of I OUT when +5-V rail shuts down. Note that the accuracy of I C R C = V ADJ is assured by the ...
.. for many applications. This Design Idea describes a portable water-leak detector that uses a common 9 V battery for power (Figure 1). The circuit consumes less than 10 uA during detection mode, and a 9 V alkaline battery has ...
.. heatsink! Also note that R S should be rated for a wattage of at least 1.252/R S . Then there’s the consideration of power up/down transients. When the system is first switched on and C 1 is sitting discharged, and the controller will ...
.. infrared (IR) signals while conserving system power is difficult, and typically requires the inclusion of complex power-management routines in the firmware. You ...
.. circuit of Figure 1 is designed for portable-power applications that require white LEDs with adjustable, logarithmic dimming levels. The circuit drives as many as ...