.. is 0.000001 ohms. I often use it to measure contact resistance of a relay or the resistance of big chunk of heavy gauge wire or the resistance of a copper trace on a circuit board. You can also use it to measure the voltage drop of a ...
.. or higher line-to-line three-phase voltage. You can feed this value from two or three phases with or without the neutral wire or from just one phase with the neutral wire. This circuit omits two diodes from the typical three-phase ...
.. At this instant, adjust preset VR2 such that Zener diode ZD2 and transistor T9 conduct to drop the collector voltage to 0.7 volt keeping LED2 ‘off.’ If the supply voltage goes below 10.5 volts, the voltage across the load ... .. ‘off.’ When a proper load is connected, the inverter will automatically turn on. Sine wave inverter PCB design An actual-size, single-side PCB for the pure sine wave inverter circuit is shown in Figures 5 and 6. Figure ...
.. the first part ( Ref. 1 ) of this Design Idea (DI), we saw how to use the TDA7052A (or similar) power amp to build a minimalist siren-type power ...
.. oscillate, the result is often smoke, perhaps with a well-cooked PCB and a side order of fried tweeter. This two-part Design Idea (DI) shows some interesting ways of (mis-)using a common power amp to produce deliberate oscillations of ...
.. “DIY RTD for a DMM” ( Ref. 1 ). With a fortnight’s struggle, I completed the design of 4 mA to 20 mA, two-wire temperature transmitter using a platinum resistance temperature detector (RTD) sensor, as shown in Figure 1. ... .. an analog circuit can be a frustrating experience, as noted by Nick Cornford in his Design Idea (DI), “DIY RTD for a DMM” ( Ref. 1 ). With a fortnight’s struggle, I completed the ...
.. fabrication of supersharp, atomic-scale needle tips. One way to make the tips is to etch them from short pieces of platinum wire in a calcium-chloride electrolyte bath. Applying an ac voltage between the electrolyte and the wire generates a ... .. offset error generally limits sensitivity to input spans no smaller than some hundreds of millivolts. The converter in this design avoids these faults and adds a number of new and useful features. The differential ac signal to be rectified ...
.. and reduces the LED-current change for less noise (references 1 and 2). References Linkwitz, SJ, “Loudspeaker System Design,” Wireless World, Volume 84, June 1978, pg 67. Self, D, “Inside Mixers,” Wireless World, ...