.. dashed line). The added circuitry comprises opto-coupler IC1, N-channel MOSFETs T1 T2, and a few passive components. When power is switched on, current flows through F1, L1, D1, IC1’s LED, C1, and the intrinsic diode of T1. ...
.. necessary. The circuit shown generates a low frequency square wave signal while drawing only 0.5 microamps from a 6 volt supply. The circuit uses a number of N and P channel MOSFETs, contained within an inexpensive CD4007UB IC. The ...
.. Idea (DI) contributors have recently explored various possibilities for ON/OFF power control using just a momentary contact “shiny modern push-button,” many of which build off of Nick ... .. stolen from Q3’s phase control signal. This (as you probably noticed), nicely avoids the need for a separate power supply, but it provides only microamps of current for U1 and friends. So, a power-thrifty topology was definitely ...
.. SEPIC (single-ended primary-inductance-converter) topology, the converter operates from a 12 V battery-backed input supply and outputs 24 V at 200 mA. The key feature is the second “coil,” which is not a coil but rather ...
.. producing excessively high voltages. Q 3 , Q 4 , Q 5 , and associated circuitry allow for blocking the converter when the power supply to the circuit is too low. A too-low power-supply level may lead to an output-pulse amplitude from IC 2 ...
.. condenser microphones require a 48-V supply to charge the internal capacitive transducer and power the internal buffer for the high-impedance transducer output. You can use a simple boost converter, a filter ...
.. recently saw how certain audio power amplifiers can be used as oscillators ( Ref. 1 ). This Design Idea shows how those same parts can be used for ... .. sooner. If R2, R3, and R4 are all equal, the maximum unclipped voltage swing across R4 is just less than a quarter of the supply rail voltage. Increasing R1 and making R4 much greater than R2 or R3 allows a greater swing for those ...
.. need current to illuminate, and current usually flows through a powersupply to an LED. A typical LED-driver circuit uses a transistor to provide current and a series resistor to ...
.. 1) has a high impedance input stage, it can operate reliably beyond 100 MHz, it can be operated with a single 5.25-V supply (or a single 5-V supply with a few added components), and it has been successfully simulated. Also, ...
.. 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 ... .. high voltage feature, Jayapal’s design switches the negative (V SS a.k.a. “ground”) rail of the incoming supply instead of the (more conventional) positive (V DD ) rail. Of course, there’s absolutely nothing ...