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betwixt's latest activity

  • betwixt
    betwixt replied to the thread Help Needed: Designing a Long On/Off delay timer for controlling a relay.
    I'm not sure the photosensor is a viable solution, be cautious of using it for calibration. Simply, the day/night transition occurs on...
  • betwixt
    betwixt replied to the thread PROBLEM IN DESIGNING HIGH PASS FILTER USING OTA.
    I'm not sure what your intended output is but the feedback and coupling paths are probably supposed to be RC networks but yours are...
  • betwixt
    betwixt replied to the thread need help with verilog coding a morse code to ascii decoder.
    It is in the FPGA forum. I have never done it and I confess to not being an expert in FPGA design, the last I did was about 10 years...
  • betwixt
    betwixt replied to the thread DS1307 RTC Accuracy Rate.
    The DS1307 is basically an oscillator and a chain of digital dividers to convert the 32768Hz oscillations into seconds, minutes, hours...
  • betwixt
    betwixt replied to the thread MOSFET load switch circuit overheating.
    Please show the circuit. From the voltages you quote, it looks more like Vgs is the gate voltage from ground instead of between gate and...
  • betwixt
    betwixt replied to the thread DS1307 RTC Accuracy Rate.
    You do realize that the scope probes themselves probably add more load capacitance than the physical capacitors and the scope measures...
  • betwixt
    betwixt replied to the thread PIC18F452.
    Three points I notice straight away: 1. no decoupling capacitors across VSS & VDD on the breadboard. This WILL stop it working! 2. you...
  • betwixt
    betwixt replied to the thread EPROM flash and change.
    Its an adapter so you can fit sockets for surface mounted ICs. Given the vintage of your MSX computer, it probably doesn't have any...
  • betwixt
    betwixt replied to the thread PIC18F452.
    If the code is good (we can't see it) and the hardware is good (we can't see it) your problem is probably the configuration bits...
  • betwixt
    betwixt replied to the thread Solar System Battery Discharge Limit.
    I'm no expert in this topic but I wonder if there is an overall advantage in setting a lower battery 'charge state' limit as long as it...
  • betwixt
    betwixt replied to the thread TL084 Op amp giving high output voltage.
    ...or if you can accept some frequency dependency, add a capacitor between R3 and ground. Without a negative supply the output can't...
  • betwixt
    betwixt replied to the thread Cascaded 555s behaving strangely.
    Using 555s at all isn't a good solution but the fix for the over-voltage problem is to add a diode across the 10K pull-up resistors so...
  • betwixt
    betwixt replied to the thread EPROM flash and change.
    Got the email thanks. Most UV LEDs radiate at about 395nM despite what the adverts say. Undoubtedly they will erase an EPROM but so...
  • betwixt
    betwixt replied to the thread Cascaded 555s behaving strangely.
    Be careful with supply decoupling, NE555s pulse current at the Vin pin as they change state. However, there is a potential design flaw...
  • betwixt
    betwixt replied to the thread Arduinoblocks.
    Possibly www.arduinoblocks.com ? Brian.
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