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  1. D

    Issue with solenoid valve

    When you use bypass capacitors on supplies like this with fast transient loads cap technology matters. Low esr helps. In this chart OSCON caps are polymer tantalums : Regards, Dana.
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    Pico second Nano second Voltage Current CONTROL

    What is the accuracy of the .5 nS and 1 nS pulse widths needed over T and V ? Assuming you want 10% resolution you would need a clocked circuit at 50 pico seconds or 20 Ghz. Or a transmission line solution that is stable over T and V. Discussion over here -...
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    Sensor clarification

    Part number of the sensor ? Regards, Dana.
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    PWM hall effect throttle problem

    This will help calculate the necessary gains and offsets needed for OpAmp solution : https://www.ti.com/lit/an/sloa030a/sloa030a.pdf?ts=1659263143500&ref_url=https%253A%252F%252Fwww.google.fi%252F Regards, Dana.
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    PWM hall effect throttle problem

    Not sure of you currents and power, but a near zero V diode..... https://www.analog.com/en/technical-articles/0v-to-18v-ideal-diode-controller-saves-watts-and-space-over-schottky.html Regards, Dana.
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    PWM hall effect throttle problem

    Send output/signal thru a silicon diode, depending on current that will drop V by .7 or more. Regards, Dana.
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    Oscillator to Generate DTMF tones

    You dont need really big table sizes : https://www.electro-tech-online.com/threads/sinewave-distortion-vs-table-size.161753/ Also you can either "lift" a table off net or gen them in code with trig function. Make sure any onchip PLL is setup to minimize jitter, if applicable. Regards, Dana.
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    Oscillator to Generate DTMF tones

    For reference do a burst of specific number of cycles approach - https://www.edaboard.com/threads/test-bed-dds-and-wavedac-burst-tool.393572/ Regards, Dana.
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    Oscillator to Generate DTMF tones

    Because he has added the "Precise Tone Plan" tones for equipment signaling ? Regards, Dana.
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    Oscillator to Generate DTMF tones

    If you wanted to do dual tone simple mod of what I showed earlier : The DACs were converted to current out, summed by the resistor, and buffered by opamp. Still single chip. I added PWM to create a timed burst for the pulse train. Whatever. Regards, Dana.
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    Oscillator to Generate DTMF tones

    The DAC output is analog, buffered with on chip OpAmp. You might use a single RC LPF to get rid of clock noise, but my guess not really necessary. You need to do a small amount of coding to make every thing work. With no serial interfaces, just the DTMF, maybe 25 lines max. Standard C code. The...
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    Oscillator to Generate DTMF tones

    PSOC 5LP would work fine in this application. Below single chip application. In addition to DTMF could do CTCSS tone set. All one chip. Basically onchip DDS generates clock for a Wavedac which generates sine. With ext xtal probably around .1% accurate. Could use a port to select tone, or do...
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    Controlling DC motor speed and direction with RF remote

    I would say this is straightforward to do with a micro, and position encoders or stepper motors, and H Bridge to manage current and phase (direction). The RF side a tad more complicated, both for electrical as well as safety reasons. An ESP32 or ESP8266 would be a good RF (depending on distance...
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    esp32 Data lost from computer to micro- controller.

    Sure sounds like a packet drop. Your link Wifi or wired ? Regards, Dana.
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    High frequency circuit board for TIG AC/DC welder, how does it work?

    That power resistor seems to have a cracked solder joint on its right leg ? Just below its lead.... I dont think the manual has a schematic of that particular board, unfortunately. You might contact them to see if you can get that. I think that transformer/inductor is part of a trigger...
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    Need Help With Relays

    You can also use H Bridges to do this - https://www.st.com/resource/en/datasheet/l298.pdf This is a dual so would need 2 1/2 of them. Have logic level inputs, can do 2A, 40+V. You have to do thermal analysis to make sure you are not running them too hot...
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    Need Help With Relays

    What is the motor current and voltage consumption ? Is this speed control or simple on / off / direction control ? A single DPDT Relay will reverse motor drive (single relay, off/on one direction, on/off reverse direction) - Regards, Dana.
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    Battery Charging Circuit

    Yes it functions as a a charger, the only current being affected is the use of the LM317 as a constant current source to charge the battery, eg. you do not have to measure current. But circuit is fixed charge current set by LM317 Rlim. Nominally one charges at .5C, so depending on pack the cons...
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    Remote control

    https://www.st.com/resource/en/application_note/an4834-implementation-of-transmitters-and-receivers-for-infrared-remote-control-protocols-with-stm32cube-stmicroelectronics.pdf https://zilog.com/docs/ir/appnotes/an0240.pdf https://www.nxp.com/docs/en/application-note/AN463.pdf...
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    Battery Charging Circuit

    Give us a little background : 1) Student exercise ? 2) Your skills, like circuit building experience, prototyping, programming (what languages) ? 3) Basics, like what resistors, capacitors, transistor do and how to use them ? 4) Ever worked with embedded board/microprocessor ? 4) Project...
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