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  1. GPG

    Clean square waves using a 555 timer?

    The standard 555 has bad shoothrough problem. Try the CMOS version. http://www.ti.com/lit/ds/symlink/lmc555.pdf You will not need R1
  2. GPG

    LM3914 LED dot display

    show circuit
  3. GPG

    Running high current electric solenoid using a H-bridge

    Depending on the application (?) a linear actuator may be a better idea https://en.wikipedia.org/wiki/Linear_actuator
  4. GPG

    ultrasonic sensor at 40 KHz

    Show circuit of transmitter
  5. GPG

    Piezo injection and high side FET drivers

    Nor for me
  6. GPG

    Choose Software or Hardware in electronics ??

    That is pretty much unavoidable these days. The software can do things and in a more flexible way than straight hardware, but the software needs hardware to run.
  7. GPG

    diy metal detector

    Fisher gold bug, Quite good cheap to run.(Batteries) Minelab supposedly the best Have not used one. Building your own ?? Google pieter heydelaar
  8. GPG

    Killing SSR (relays) - Need to understand

    Inrush at switch on may be a problem. Make your own SSR using a zero crossing driver.
  9. GPG

    Presettable counters

    Better CD4522 or similar also see CD4527
  10. GPG

    Presettable counters

    Is there a question?
  11. GPG

    vacuum fluorescent display (VFD) help

    AC . measure between the pins
  12. GPG

    JFETs as a current source and a question.

    The left transistor requires a resistor too. Not 10 AND 100, 10 to 100.
  13. GPG

    JFETs as a current source and a question.

    Put a degeneration resistor between the emitters and ground.10 to 100Ω should be enough depending on the match
  14. GPG

    MOSFETs shooting through in H-bridge: damage at gate-source driving circuits

    Show circuit, there are drivers that take this in to account
  15. GPG

    CD 4047 inverter

    Heat the core in an oven. They come apart easily Cut the winding off first
  16. GPG

    Switching Multiple Circuits Simultaneously

    What voltage/current to switch? There are many analog switches.
  17. GPG

    Transistor to control resistance

    Link ?
  18. GPG

    Record player motor voltages

    Yes
  19. GPG

    Microwave inverter project

    I think he means a switch mode supply
  20. GPG

    LM339 Low voltage alarm help

    LM339 is a quad comparator 3 sections unused in your diagram. An LM393 is a dual and could be used to give a warning (LED) and cutoff at different voltages. Still need a transistor either as a relay driver or (MOSFET) switch
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