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Recent content by BradtheRad

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    Testing for a resistor value without using a multimeter?

    Nowadays there's bicolor and tricolor led's in various terminal configurations. You're not limited to the older type which lit red in one DC direction, green in the other DC direction, and yellow with AC. The window comparator method (as in post #3) should make it feasible to detect all...
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    SOT223 with 1.1W dissipation and gap pad to its plastic case top?

    * Can you re-arrange for any load to have its own current path? Give the load a 20V source on one end, an 18V source on the opposite end, for a net voltage of 2V? * Can you stack two or more loads in a series string? Two loads in series could accept 4V, thus giving each load 2V. Your 20V supply...
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    Circuit Diagram

    A PLL circuit uses 4046 and 4017 to multiply a frequency times 2 or 3 or 4 or 5 or any integer up to 10. I see it in Forrest Mims Engineer's Notebook, page 37. (Although the 4017 divides by counting, the 4046 converts this function to multiplication). So in this way multiplying 2 kHz by 5 to...
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    Circuit Diagram

    Is 'up-convert' a term chiefly used in radio? It suggests sine waves. Can you clarify whether you're converting sines or square waves or DC pulses? One or the other waveform may lend itself to a different approach for this exercise.
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    2 phase boost control IC, 100kHz, current mode

    For a while I tried to use other devices in Falstad's simulator (such as Schmitt triggers, op amps, SR flip-flops made from NAND gates, inverted inputs and non-inverted inputs, etc.). However at start-up these devices hadn't receive definite inputs from earlier devices. The output devices...
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    2 phase boost control IC, 100kHz, current mode

    Method using separate counters for each converter. This allows a single adjustment to vary duty cycle from a few percent to almost constant on, applying simultaneously to all converters. This simulation has 4 bit counters although any desired amount is suitable. Halfway through a cycle the MSB...
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    HV PSU without any capacitor?

    You describe a choke-input filter (smooth-er). Usually we see capacitive filtering because it's easier to work with. Capacitive type tends to pull up waveforms at peak, producing maximum possible voltage with light load. Choke filtering tends to average incoming waveforms, resulting in less...
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    [SOLVED] Need to make a up down counter from 40-00 and 00-40 without resting using two 74192 ic. Pls help

    Did you yet build a one digit counter? Using any of the popular IC's? Does the exercise accept bare led's at the 4 output pins to indicate binary patterns? Or to make the count easy to view, attach a 7-segment decoder IC & numeral display. Cascade two such setups to make a two-digit counter.
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    Help with sequential circuit and sequence detector

    I think 'don't consider overlapping' means you must start a new count to 3 after you already found one group of 3 equal bits. In other words 4 or 5 equal bits together should not be considered as two occurrences of the target outcome. However 6 bits in a row can be called two occurrences.
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    I want to switch solar panels between different systems, how?

    I had my backup power system in our house where a change-over switch was already installed in the circuit breaker box. It's a similar situation as running a generator in the garage during a blackout. Without the change-over switch we must resort to running extension cords to all appliances we...
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    Inquiry about Washing Color Testing Machine

    This sounds like a system that optically detects how well a washing machine (or washing detergent) gets stains out of clothes. The colors might be seen through different filters. Red for ketchup, yellow for mustard, etc. Brightness of whites could be gauged visually by photosensor in the same...
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    Logic or sample code to detect the zero crossing Also how detect the positive or negative cycles

    To detect zero crossings, make use of the 90 degree capacitive phase advance. Detect peaks of the resulting sine wave. The peaks are zero crossings. To detect positive portion of cycle, place a diode and capacitor to send a pulse at positive peaks. Add a similar network with diode oriented to...
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    A varying-frequency control Flyback rectifier for constant current LED driving in Boundary-Conduction Mode

    I'm running a flyback simulation with transformer 1:1. I'm unable to achieve satisfactory performance unless I set the step-down ratio 1:0.4 or 1:0.3. If it's really 1:1 as in the listing, then why not use a plain buck instead? You'd have one coil to make life simpler. I thought the advantage...
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    Induction heater

    I guess the heating unit is a large coil (inductor)? And it presents a load (medium impedance) to high frequencies? But suppose it's getting only a low frequency (or mains frequency 50/60 Hz), then it offers low resistance. Maybe carrying sufficient Amperes to blow a fuse immediately as well as...
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    driver compression logic

    Class D operation, or SPWM. One op amp, 5V supply, single-ended. Output alternates between 5V and 0V ground. In this manner it converts one-half (upper half) of the incoming sine waveform. It took me a while to achieve this much with a simple circuit... since it's still missing the negative...
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