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  1. KrisBlueNZ

    4 Channel Diversity Controller

    Hi Paul. No, I don't know him. I don't know about the application either. I will send you a PM with the email address he used to register on Electronics Point.
  2. KrisBlueNZ

    4 Channel Diversity Controller

    Hi paulpaulo26 and welcome to Electronics Point. I have removed the email address from your post for your own safety. If Scott still uses Electronics Point, he can respond to you using a private message. This thread is over a year old so you may not get a response from him.
  3. KrisBlueNZ

    Hello, we are Gleamia

    Hello you are gleamia. Please be sure to read Electronics Point's terms and conditions of use at https://www.electronicspoint.com/help/terms In particular please notice that we have an anti-spam policy that we police aggressively. You are very welcome to ask questions and provide answers to...
  4. KrisBlueNZ

    ICL7665s confusion

    Here's a circuit that may do what you want. It uses a P-channel MOSFET instead of a relay and has a pretty low power consumption. It uses the built-in hysteresis feature of the ICL7665 and has threshold voltages of 12.5V (rising) and 10.0V (falling). The battery can always be charged...
  5. KrisBlueNZ

    Timing Circuit? Counter?

    LOL :-) Don't be so hard on yourself. I think the existing circuit will work OK with a few component value changes. RA changes from 4k7 to 1k5 R1 changes from 30k to 10k R2 changes from 120k to 15k RIN changes from 30k to 15k (this change is just to avoid an extra line on the BOM) CT...
  6. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    OK, cool. Are you going to add the resistors across D8 on the schematic? They'll have almost no effect on the circuit's operation with a coil connected - the coil current will be over 1000 times higher! So I would make them a permanent part of the circuit. OK. Do you have an oscilloscope? I...
  7. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    OK, can you mark up the changes on the schematic and re-post it. Exactly. Do whatever's easiest. You wouldn't use a 10 pF capacitor instead of a 10 µF capacitor, but you're using an unknown core...? You know that the characteristics of ferrite cores vary quite widely, right? Based on the...
  8. KrisBlueNZ

    N-type JFET LED CIRCUIT

    The change you need to make is to apply a negative voltage to the gate, not a positive one. This will turn the JFET OFF, i.e. make it STOP conducting. With 0V between its gate and source, a JFET will CONDUCT. This is different from junction transistors and MOSFETs, both of which need a source of...
  9. KrisBlueNZ

    Timing Circuit? Counter?

    A voltage can't exist at one point. A voltage is a DIFFERENCE in potential between two points. When you measure the voltage, which is 0.7~1.3V with a multimeter, you connect your red probe to that wire, right? And what do you connect your black probe to? That's what you need to connect to the...
  10. KrisBlueNZ

    Timing Circuit? Counter?

    The circuit monitors the voltage between the two wires at the left. The top wire, connected to RIN, must be positive. The negative side of the voltage that you want to monitor must connect to the bottom wire, which is the 0V rail of the whole circuit and connects to the negative side of the...
  11. KrisBlueNZ

    Transistor alternative

  12. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    The voice changer's signal is supposed to come through the power amplifier in the amp unit. You should disconnect the voice changer's own internal speaker. See what happens then.
  13. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    Before you measure the voltage at the cathode of the UF4007, connect two 3k3 1W resistors in series, across D8. You can (and should) leave those resistors in place. It will enable C8 to provide some smoothing on the converter's output voltage when no coil is connected. Also, disconnect the...
  14. KrisBlueNZ

    Roland Amp Satellite Speaker problem

    Where's the rest of the circuit boards? On the other side of the brown divider in the last picture with the wires going through it. Where do they connect?
  15. KrisBlueNZ

    12V - 350V 200mA converter for motorcycle CDI

    What's the output voltage at the cathode of the UF4007 in your constructed circuit? How are the primary and secondary phased relative to each other? Can you add dots to the transformer symbol on your schematic to show the phase relationship between primary and secondary?
  16. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    Oh dear. This tone comes from the speaker in the amp unit, right? What happens when you adjust the volume control? What happens when you plug in the microphone and talk into it?
  17. KrisBlueNZ

    Chicken Coop Door Opener

    Looks good Dan! You can use a bridge rectifier component, or four diodes, whichever you like.
  18. KrisBlueNZ

    Heyelp! Tapco S5 active monitor problem

    That sounds like there's something wrong apart from the bridge rectifier. Unless you measured that with the transformer plugged in. Take out the bridge rectifier and unplug the transformer, and measure resistance across the two big electrolytics again. If either of them measures short circuit...
  19. KrisBlueNZ

    Heyelp! Tapco S5 active monitor problem

    Ah, so you did, sorry. I'm helping several different people at once and it's hard to keep track of their level of knowledge! Yes, I suspect the bridge rectifier. It could have caused the electrolytic to pop as you described. Which electrolytic did that? Is it in the area in the second photo? I...
  20. KrisBlueNZ

    Combining an Amplifier with a Voice Changer?

    Exxxxcellent, as Mr. Burns would say :-) FYI that 1Ω multimeter reading is just the resistance of the multimeter probe leads and the meter's internal circuitry. If you touch the probes together you'll still measure 1Ω. So you can ignore it; if the meter shows 1Ω then there is full continuity...
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