.. L F P = PWM rep rate N = PWM bits of resolution, N 4 R1 = recommended value from U1 datasheet example application 8. ; 9. ; 10. ; 11. R3 = Vpp/(Vs/R1 + (V L V S )/(R1 + R4)) 11. ; 12. ; 13. ; Now, taking the inexpensive XLsemi XL4016 asynch ...
I recently published a simple design ( Ref. 1 ) for a platinum resistance detector (PRTD) 4 to 20 mA transmitter circuit, illustrated in Figure 1. Figure 1. The PRTD 4 to 20 mA loop transmitter with constant current PRTD excitation that relies on ...
.. trim for a 3.500 V output reading. Finally, set the box to 249.0 Ω (400.00 C) and trim the linearity adjustment for a 10.000 V output. Repeat this sequence until all three points are fixed. Total error over the entire range will be within ...
.. 1. Variable AC power control with a simple pushbutton. When S1 is pushed, counter U1 ramps through the 64 DAC codes in a 2 10 /120Hz = 8.5-second cycle and stops on any selected power setting when S1 is released. Power control method The power ...
.. frequency from 2 MHz to 1 MHz to allow for the 75-ns minimum off time. This would also require increasing L1 to about 10 µH to 15 µH and doubling up on bulk-output capacitor C4 to maintain equivalent performance. References ...
.. was to amplitude-modulate the power output stage of an infrasonic microphone ( Ref. 2 )That gadget generated both the sub-10 Hz baseband signal and an audio tone whose pitch varied linearly with it, allowing one to hear at least a proxy for ...
LEDs need current to illuminate, and current usually flows through a power supply to an LED. A typical LED-driver circuit uses a transistor to provide current and a series resistor to decrease the voltage you apply to the LED. Unfortunately, the ...
.. the mismatch between test parts A and B. The resulting difference signal is boosted by preamp A1d in switchable gains of 1, 10, or 100, synchronously demodulated by U1a, then filtered to DC with a final calibrating gain of 16x by A1c. The key ...
.. I expect it to operate at the lower frequencies at least as well as Woodward’s circuits. Operation down to 1 Hz or 10 Hz is, in my opinion, mostly for bragging rights, and I am not concerned about that. I expect this VFC to be useful ...
We’ve seen lots of interesting conversations and Design Idea (DI) collaboration devising circuits for power switching using inexpensive (and cute!) momentary-contact SPST pushbuttons. A recent and interesting extension of this theme by ...