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  1. KrisBlueNZ

    0.5 second monostable pulse??

    Cool :-)
  2. KrisBlueNZ

    Voltage controlled thru opamp playing up?

    PWM ------\/\/\/\/------ op-amp_buffer ------ output | ----- ----- | ------------------------------------------------------- 0V
  3. KrisBlueNZ

    0.5 second monostable pulse??

    Hi William and welcome to Electronics Point :) That circuit should behave the way it does in the real world. A 555 connected as a monostable will hold its output active while its trigger input is held low. I don't know why the behaviour is different in iCircuit. Perhaps there's something odd...
  4. KrisBlueNZ

    A friendly "Hello" from Bremen, Germany

    Welcome! Thanks for joining up. I'm sure your input will be valuable :-)
  5. KrisBlueNZ

    0.5 volt signal to earth signal

    Right, sorry, pin 4 is the signal. You'll need a small-signal diode such as a 1N914 or 1N4148. These should be on the shelf at Radio Shack. http://www.radioshack.com/product/index.jsp?productId=2062576. I can't believe they want USD 1.99 for a diode that costs less than a cent each in large...
  6. KrisBlueNZ

    0.5 volt signal to earth signal

    Hmm. Okay. I have a suspicion that the signal on pin 7 is not a DC level, because 0.5V is not a very convenient or sensible voltage. I think the signal is probably a "rectangular wave" aka a "pulse stream", when the hydraulic lifter is in action. That is a voltage that alternates rapidly...
  7. KrisBlueNZ

    0.5 volt signal to earth signal

    I don't think this ISO 11783 connector "sends a 0.5 volt signal when a hydraulic lift switch is operated". I searched for ISO 11783 and found this text on iso.org: Also on can-cia.org I found this: So I think that ISO 11783 (aka Isobus) is a serial data bus based on CAN (the serial bus...
  8. KrisBlueNZ

    Transistors

    Common emitter and common base configurations amplify voltage. See http://en.wikipedia.org/wiki/Bipolar_junction_transistor#Applications Under "Amplifiers" there are links to articles on the three configurations, which have reasonable descriptions. If you have any specific questions after...
  9. KrisBlueNZ

    Remote Control Circuit with CD4017 - counter decoder

    You're welcome :-)
  10. KrisBlueNZ

    Reel to Reel Deck Issue

    Hey, that's not a bad piece of gear! In addition to Harald's suggestions: 1. This popping noise, is it a single pop sound? 2. Is the volume of the popping sound affected by the volume control settings? If you turn all the tracks down to minimum, does it still happen? Is it coming in on a...
  11. KrisBlueNZ

    Please, check for possible mistakes

    So you were getting about 215 VDC into a 100W, 230V light bulb? That's good! Is this just using the converter, without the 50 Hz H-bridge section? You must have been lucky with your transformer core. There's a wide range of them around. Do you have any way to measure the inductance of the...
  12. KrisBlueNZ

    Remote Control Circuit with CD4017 - counter decoder

    The CD4017 responds to the rising edge on its clock input. That is, each time its clock input pin is brought from low (GND in that circuit) to high (+5V), it advances by one count. Assume the 4017 is currently at count 0. This means that the "Q0" output, pin 3, is the only output that will be...
  13. KrisBlueNZ

    Programming Languages

    I mean C, not C++. Small microcontrollers have enough of a struggle supporting plain old C.
  14. KrisBlueNZ

    Programming Languages

    In my experience, most microcontroller programming is done in C and assembly language. Some environments use other languages such as BASIC and the Arduino language, and Java can be used on less resource-constrained devices. Many languages are based on C's syntax, and C is a good compromise...
  15. KrisBlueNZ

    Voltage regulator - Solar panel

    The amount of heatsinking you need on a regulator depends on how much power it dissipates. For a switching regulator, you can estimate this from the efficiency. Here is one way (not necessarily the best way) to calculate it. Say the regulator is 80% efficient and your maximum load on the...
  16. KrisBlueNZ

    Voltage controlled thru opamp playing up?

    You don't need anything special to convert a PWM signal into a voltage that corresponds to the duty cycle; just one or more cascaded R-C circuits, as the OP has done. diagnostix: 1. Do you still have the same problem with the translation from input to output voltage? 2. Can you post the...
  17. KrisBlueNZ

    Remote Control Circuit with CD4017 - counter decoder

    Start by reading the data sheet for the TSOP1738: http://pdf.datasheetcatalog.com/datasheets/208/301092_DS.pdf The device has an active low output. That is, its output pulls low (to 0V) when it is receiving an infra-red stream modulated at 38 kHz. The way the circuit is supposed to work, when...
  18. KrisBlueNZ

    555 simple oscillator not working with small capacitors

    A 555 is not an accurate frequency source. Your best option would be a crystal oscillator and a frequency divider. If you need exactly 48.000 kHz, you can derive this frequency from many standard crystal frequencies, but the easiest option is a 6.144 MHz crystal frequency, divided by 128. This...
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