Type: Posts; User: BradtheRad

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  1. Closed: Re: UA78M33CDCY 3,3 volt regulator will not regulate at input voltage above 12 vol

    There is always this ordinary voltage regulator made from an NPN and zener diode.

    The zener can be a string of led's and/or diodes. It can even include a low-ohm resistor although regulation is...
  2. Closed: Re: Invasive blood pressure monitoring. How to?

    Files less than 500kB are more likely to get through the upload routine. This is not a rigid rule but a glitch during upload could cause the system interface to cancel.

    Further things to try:...
  3. Closed: Re: Invasive blood pressure monitoring. How to?

    Nowadays the 'Insert Image' icon seems to be the reliable method.


    Once your image uploads successfully, submit your message within a minute or two, lest it expire unused.
  4. Closed: Re: How to make cluster computer with MSI desktop and MSI laptop

    Can you find (or write) software that simply sends and receives data via USB at each computer? If you can gain control over such communication then you might get a cluster concept to work, regardless...
  5. Closed: About 30 minutes limit for editing posts

    [ Original thread: Shortcircuit protection circuit - post#15 ]

    A few years ago forum administrators decided it was too easy for any spammer to post a message, then go back later so he could...
  6. Replies

    Closed: Re: Chossing MOsfet for boost converter

    Is your initial power source 12V? If so then the step-up ratio is 2 which leads to the option of a voltage doubler based on capacitors.


    This simulation demonstrates a concept. Components...
  7. Replies

    Closed: Re: Solar panel regulator

    Buck converter controlled by transistors. NPN & PNP arranged as a sziklai pair. They provide high gain, resulting in snap action. The waveform through the inductor creates the bias to the leftmost...
  8. Replies

    Closed: Re: Chossing MOsfet for boost converter

    Consider interleaving two or more boost converters. By staggering On-times, it lets you operate additional mosfets yet stay within limits.
  9. Closed: Re: Speakers make a loud noise when turning off. Is there a way I can eliminate it?

    Since the loud pop is heard in both channels, it suggests a power supply problem. (Whereas if it were in only one channel, then you could try switching components between them in an effort to track...
  10. Replies

    Closed: Re: Digital Transition Capture

    I wonder whether some kind of flip-flop detector would work. However I'm not certain whether you can get it to it work on a single up or down transition, or whether it requires an entire cycle.
  11. Replies

    Closed: Re: Best topology DCDC adjustable output

    You have two diode bridges across a tapped transformer. It looks okay on paper but it needs close checking to be certain you avoid a short circuit through two (or more) diodes at some point in the...
  12. Replies

    [SOLVED]Closed: Re: Operation of variable inductance

    Were these installed in old-fashioned radios? I've read how regenerative receivers were built for a while. They had an extra tuning knob attached to the variable inductors. A listener would dial in...
  13. Replies

    Closed: Re: DCDC Step down possible circuit?

    It's suitable to stay with this thread since its title still describes the purpose of your project. And topologies being considered, in hopes to reach a successful design.

    - - - Updated - - -
  14. Replies

    Closed: Re: SD Card not showing 4 GB

    Your screenshot shows the Capacity selector having a pop-down arrow to the right. What options do you see when you click the Capacity selector?

    If you did a Quick format then it probably repeated...
  15. Closed: Re: How to move metal elements via magnetic waves?

    A grid of electromagnets under the table might do the job. Make the metal piece globe-shaped, or else floating on water. Turn on a nearby electromagnet to attract the metal piece. The table must be a...
  16. Closed: Re: Spread spectrum clock generator using dcdl

    To delay a pulse train, one easy method is to send it through an RC integrator. This results in a ramping (or quasi-triangular) waveform. Restore DC pulses by following up with a logic gate.
  17. Closed: Re: TL431 temperature compensation method question

    A 5V zener diode is relatively unaffected by temperature. At that volt spec, the effect of avalanche breakdown and tunneling breakdown are about equal. One is a positive temperature coefficient and...
  18. Closed: Re: Voltage inverter feedback for microcontroller (TL431 and 4N25)

    You have 12v going through 220k ohms (R54). This results in 55 uA which is available to light the led in the optocoupler. It's a miniscule amount. Shouldn't it be more? On the order of 1mA to 5mA?
  19. Closed: Re: Crt tv - click sound turn off and i start again

    Don't some tv's perform degaussing briefly every time you turn it on? Then if your degaussing circuit draws overmuch current, the power supply droops. The tv may just barely turn on, causing the...
  20. Replies

    Closed: Re: simple proximity sensor, help needed

    To be useful your project ought not send an alert in total darkness even though IR is absent then. I think you want a circuit which has two detectors: (1) one for IR, and (2) one for visible light. ...
  21. Closed: Re: Are DC to DC converters a type of SMPS?

    I lean toward calling them 'switched-coil' converters because it is more specific and more descriptive (seeing that they contain one or more inductors).

    In fact Motorola tries to discourage...
  22. Replies

    Closed: Re: How to block unwelcome user replies?

    Sometimes it helps to keep perspective when we apply the expression: "It takes all kinds to make a world."

    It's true in daily life and at message boards.
  23. Replies

    Closed: Re: differential probe with oscilloscope

    I presume this resembles your setup. My simulation is 3-phase delta. Each phase created from 2 transistors. The gating signals are square waves. Shoot-through does not occur. Waveform to loads is...
  24. Replies

    Closed: Re: [SMPS]Flyback converter

    Principle of flyback operation:

    1) Current goes through transformer primary.

    2) Flux field builds however no current flows in the secondary due to the diode preventing it.

    3) Current is shut...
  25. Replies

    Closed: Re: Charging an unloaded capacitor

    A capacitor-based voltage multiplier has an advantage over the inductor-based boost converter. With capacitors the output voltage can never rise above a certain limit. This reduces the risk of...
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