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  1. WHONOES

    Oscillations in the gate signal with IXFN 150N65X2 transistors

    You don't want any additional inductance in the gate leads (the inductor will ring of its own accord ) or for that matter, resistance. You should try adding ferrite beads to the gate leads as close to the gat pin as possible. These will present a high impedance to any unwanted oscillation on the...
  2. WHONOES

    Oscillations in the gate signal with IXFN 150N65X2 transistors

    Please explain what and how regarding the toroid ferrites used.
  3. WHONOES

    electronic load

    Have a look on the datasheet of your chosen device for a graph entitled "Maximum Safe Operating Area". This defines the maximum voltage and current combinations for your choice. Don't be tempted to load you device to the maximum permitted. Keep it to 50% or less. Also, have a look at the...
  4. WHONOES

    electronic load

    Sounds as if the Fet is oscillating of its own accord. That can happen if you have a long wire between your opamp an the Fet gate. It is also possible that the opamp is unintentionally oscillating because of poor or non existent PSU decoupling. Trying one thing at a time, connect a 10μF...
  5. WHONOES

    What are these?

    Have you tried swapping the battery polarity over?
  6. WHONOES

    NAND logic gates - feedback

    Start with the basics. Consider that a "1" on both inputs of a Nand gate will produce a "0" on the output. Any other combination on the inputs will result in a "1" at the output. Now consider the schematic and construct a truth table one stage at a time.
  7. WHONOES

    Video signal amplifier.

    If you only want to power some LED lamps in the middle of nowhere, have you considered using a Sterling cycle engine to drive your generator. Being and "external combustion" motor, you could burn absolutely anything such as scavenged wood or dead physicists to power it.
  8. WHONOES

    Push Button Sequencer Switch (No ICs)

    Think I spotted some IC's in the 16 channel version.
  9. WHONOES

    Peltier Element- Schematic Help H-bridge

    Why not simply use a relay wired to perform the crossover function. Much less complicated.
  10. WHONOES

    Video signal amplifier.

    Look at the link below. It details a hydro storage system in North Wales. Water is pumped from the lower lake to the upper lake at night when demand is low and power stations are still generating. The facility is then used to generate power during daytime peaks...
  11. WHONOES

    Varying the output frequency of an ultrasonic driver board

    What are you planning to use it for and how much power do you need?
  12. WHONOES

    HV Rat Killer

    I think this guy has an over inflated ego that cannot bear to be challenged. One can only hope that he does indeed keep to his promise to quit this forum and leave it to those who are prepared to listen to other learned persons opinions and safety warnings when embarking upon their own projects...
  13. WHONOES

    Video signal amplifier.

    Further to building an AD811 amplifier that will work. Analog Devices have available a SOIC amplifier evaluation board available that would help. It is not specifically aimed at the AD811 but is infinitely preferable to trying to get one to work using strip board. See link below...
  14. WHONOES

    Video signal amplifier.

    I should have pointed out that the AD811 is a current feedback amplifier which means that its bandwidth is dependent on the value of feedback resistor. So.… don't mess with the values prescribed in the datasheet. See page 14 of the Analog.com datasheet Revision G. See link below...
  15. WHONOES

    What is wrong with my wireless circuit?

    Have you had a look at what's coming out of the receiver or the transmitter for that matter?
  16. WHONOES

    Class AB Power Amplifier Design

    Seems like OMARTAREK206 fell into the trap of trying to do it all at once. He needs to break his circuit down into small lumps (as you would any design) and get each bit working before joining them al together. Perhaps he should start with a simple one transistor class A amplifier and understand...
  17. WHONOES

    Video signal amplifier.

    Try this link for a description of cable impedance and why it affects applied signal. https://electronics.stackexchange.com/questions/93232/how-is-xΩ-impedance-cable-defined
  18. WHONOES

    Video signal amplifier.

    I would suggest that he use RG178 which is a 1.78mm diameter 50Ω cable properly terminated at each end, as mentioned earlier, and an AD811 video amp with a gain of 2 to compensate for reduction of signal be the termination.
  19. WHONOES

    Powering Electronic Match

    Many moons ago, I used a simple igniter for some "flash pans". These are simply a small amount of powdered magnesium in a container which was usually a piece of cardboard tube with a piece of card glued to its bottom. The igniter was simply a couple of inches of small gauge copper wire...
  20. WHONOES

    Video signal amplifier.

    If I remember correctly. Flat cable is 300Ω TV coax is 75Ω and instrument type Coax is 50Ω. You would normally use a source resistor at the transmission end and a load resistor at the receiving end of the appropriate value. A proper video amplifier such as the AD811 would be beneficial too.
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