Irf9530

Figure 8.37 An isolated dc dc rated at 3 kV with a maximum 60-Hz leakage of a 2- a A converter powers the battery charger circuitry. A single-chip gel-cell charge controller IC (UC3906) charges two sealed 12-V batteries. Q4 switches power to the high-voltage power supply from the +24-V battery. This switch is tumed-on by Q5 upon receipt of the appropriate command from the shock-box microcontroller. IC9 produces 5 V to run the microcontroller and associated logic. Figure 8.37 An isolated dc dc...

Clinical Uses Of Electrical Stimulation

Clinical electrical stimulation is simply the application of electrical currents to a body, be it for function or therapy. As we just discussed, the current of electrons passing through the wires is converted into a current of ions moved within the tissue, which are in turn capable of transporting electrical charge across the membranes of excitable tissues. The purpose of these applied currents is to cause the targeted depolarization of nerve and or muscle to threshold. The most common clinical...

Electrode 2

Interferential Frequency Circuit

Figure 7.19 Circuit of a battery-powered, two-channel TENS unit. IC1 produces a pulse every time the stimulation channels need to be triggered. The trigger frequency can be varied between 3 and 100 Hz. Burst TENS is activated when SW2 connects the reset line of timer IC3 periodically to inhibit IC1 from oscillating. Modulated TENS is enabled by closing SW3, which allows a triangle wave generated by IC2 to modulate the frequency of IC1. The electrodes are driven by step-up transformer Tl....

Free Data Acquisition Card In Your Computer

If you need to measure one or two audio-frequency signals that do not include a dc component, don't overlook the data-acquisition card that your PC probably has already your PC's sound card. Audio-range signals can be applied to a sound card via stereo j-in. mini jacks. Inside the sound card, these signals are ac-coupled, with one pair of inputs being sent through preamplifiers for boosting low-level signals intended to amplify microphone signals , and another pair feeding signals within a 0.5...