.. was surprised recently when a (nearly) two-decade-old design idea of mine for take-back-half temperature control ( Ref. 1 ) got a question from reader John Louis ...
.. up with suitable power output stages, which is indeed common practical practice. Problem solved. But just for fun, this design idea takes a different path to power by merging a venerable (the “L” stands for ...
.. subcircuit that uses degeneration of a PNP transistor to achieve zero temperature coefficient (tempco or TC). This low-cost design is the result of collecting data on many semiconductor devices over a 15+ year period and frequent reviews of ...
.. noise annoys. Occasionally, it can be a valuable tool. Surprisingly, there is a whole palette of noise colors [ 1 ]. This design idea (DI) shows good ways of generating the commonest and most useful ones, which are white [ 2 ] and pink [ ...
.. capacitance at its output. For this white noise generator circuit, some output capacitance that leads to peaking can be a design feature rather than a hazard. The output sees 10 kΩ R S and a 50 nF C X to ground. This capacitor C X ...
.. Yellow and white LEDs have been successfully tested. Don't forget to shade the optocoupler in bright light. Figure 4. Design of a homemade optocoupler. The filter capacitor C3 can be omitted when working with frequencies above 1 kHz; ...
.. circuits can be characterized by sweeping the input signal across a range of frequencies and observing the response of the design. Input sweeps can be composed of discrete input frequencies or a swept sine. Extremely low frequency sine ...
.. into via standard RS-232 output signals (e.g., RTS and TxD) and used to power attached analog and digital circuitry. This design idea (DI) does exactly that by using asynchronous RS-232 to power and count pulses from a simple 10-kHz ...
.. voltage (V OC ), as long as they do not consume an appreciable amount of current relative to the module I SC . In this design, current through R1 and R2 contributes an error of 19 µA, or 0.0038% of I SC . Figure 4. PV capacitive ...
.. parts count) than the King’s? It’s partly the self-compensating TBH diode charge pump described in an earlier Design Idea: “Take-back-half precision diode charge pump” ( Reference 2 ). It also gets help from AC ...