.. at some point, differences in ground potential and excessive bus capacitance begin to erode noise and timing margins. This Design Idea shows how to provide fast, glitch-free optical isolation of I 2 C or SMBus signals by using a method ...
.. speed, without any applied drive. Knowing the relationship between the back emf voltage and the shaft speed, you can design a circuit to maintain any constant motor speed by monitoring the back emf voltage. But, few motors use a ...
.. designs rely on highly integrated ICs that conceal their internal operation. The type of Li-ion charger outlined in this design is, somewhat surprisingly, not readily found in a general review of available internet and YouTube resources. ...
.. a low dropout 5 V regulator. More generally, any 5 V regulator IC can be employed, so long as the dropout is under a volt. Typically, RC servos run on 6 V, though some will run on as many as 8 V. The nominal input, indicated as 6 V ...
.. to 0-20 mA and deliver it to a grounded load with no additional power supply needed. Recently, EDN kindly published a design of mine for a micropower 4-20 to 0-20 mA current loop converter ( Ref. 1 ). Shortly thereafter, in the grand ...
.. behavior. Note that at one full standard sun intensity, only about 70% of the peak current is available at the needed 0.525 volt point. However, as a lithium ion battery reaches the target 4.2 volts, the charge current naturally tapers off, ... .. Figure 5. 2.2 amp-hour lithium-ion battery. Figure 6. 4.9 amp-hour lithium-ion battery. Version 2 Jim Wilber looked at my design for a battery charger and sent me some suggested changes. He suggested using the LTC4412 ideal diode IC to ...
.. and can be positioned 1000 feet away. The circuit uses a custom ferrite toroid type transformer. About 20 turns of magnet wire forms the primary winding and 10 turns forms the secondary winding. A simple Schmitt trigger oscillator drives ...
.. input is grounded. A detailed description of a loop current converter with governing equations can be found in my earlier Design Idea “A 0-20 mA source current to 4-20 mA loop current converter” ( Ref. 1 ). As a bonus, this ...
.. tolerant, linear 4 to 20 mA, current mode output. Figure 3. Dangling the TLV431 shunt voltage reference Z1 from the 15 volt supply is a shortcut toward implementing a noise- and cable length- tolerant current mode output. Here’s ... .. linearized output is a useful elaboration of a capacitive sensor design. But what if the circuit is located a significant distance from the control electronics? Recently, Design ...
.. circuit also ratios sensor capacitance to a reference capacitor to measure micrometers this time linearly. A few weeks ago, Design Ideas published a simple circuit of mine that provides an analog interface to capacitive position sensors ( ...