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  1. WHONOES

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    Try sending a pulse of 1.1ms to 1.0ms every 20ms which is the normal frame rate for R/C although that is not set in stone and can vary but, it is the principal that is important.
  2. WHONOES

    Controlling Goteck Linear Servo Micro Analog 1.5g GS1502

    Why are you quoting 1000 and 2000μs what is wrong with 1 and 2 ms?
  3. WHONOES

    Centre tapped Transformer

    Are your measurements with or without a load?
  4. WHONOES

    Centre tapped Transformer

    Is the phasing of the transformer secondary's correct? Using the notation: S = Start of winding and F = Finish of winding, the secondary must be connected in the order: S, F, S, F. Otherwise the secondary's will effectively be in parallel which means that it is giving half wave rectification...
  5. WHONOES

    Series Voltage regulator.

    R4 is not needed. The information for setting the output voltage is on the diagram basically Vz (zener voltage) + Vbe (base emitter voltage) x the ratio of R1 and R2 (R1 / R2). VR1 is normally included to compensate for variation in the tolerance of the Zener voltage and to a lesser extent Vbe...
  6. WHONOES

    Diode Equivelent

    Have a look at the attached link. http://www.cedmagic.com/tech-info/rca-diode-transistor.html
  7. WHONOES

    Choosing correct capacitor

    Have to agree with Harald. It makes most sense.
  8. WHONOES

    BMS for Lithium Iron phosphate battery bank LiFePo4

    The standard of English on the makers website doesn't make it easy to determine what the unit actually is and what it does.
  9. WHONOES

    Behringer B1520 PRO Crossover / Coil inductance

    Building crossovers is not as terrifying as it might sound. In fact with the right information for choke and capacitor values, it is quite straight forward. Once armed with the speaker impedance and the crossover frequency it takes just a few minutes to come up with a mathematically correct...
  10. WHONOES

    Behringer B1520 PRO Crossover / Coil inductance

    Without appropriate test kit it will be impossible to measure crossover components. You could try Behringer to see if they will divulge the info you want but I doubt they will. Failing that, armed with the crossover frequency you could try designing your own Xovers and acquire the parts and...
  11. WHONOES

    Wheel chair battery

    I assume that you are aware that the method of charging the two differing types of batteries is not the same.
  12. WHONOES

    What to Do With a Lot of Salvaged Speakers?

    Yes tapping a disconnected speaker in series with another will cause the non-tapped speaker to make a noise. Assuming that they are both in a box then it is the pressure pulse from the first speaker that causes the second unit to respond with the physics of the enclosure having an influence. If...
  13. WHONOES

    Upper frequency limit of an oscillator

    If you insist on using such high value resistors, stray capacitance is going to have a substantial effect. Also, as has already been alluded to, Ft will also come into play. ac gain will diminish with increasing frequency. It could be that your circuit simply runs out of gain or that stray...
  14. WHONOES

    What to Do With a Lot of Salvaged Speakers?

    You are partly right and partly wrong. Yes a speaker does have a mechanical resonance plus an electrical resonance as well as several other factors that determine how it will perform in a particular enclosure. One of these is its Qts (which is a sum of mechanical and electrical Q's) which can...
  15. WHONOES

    What to Do With a Lot of Salvaged Speakers?

    Used to do the same here in the UK except we listened to Radio Luxemburg with all that glorious music of the sixties.
  16. WHONOES

    What to Do With a Lot of Salvaged Speakers?

    You can make smallish indifferent speakers sound reasonable by using contouring filters. Bose did it for many years (and may still do so).
  17. WHONOES

    As cheap as PWM duty sweep

    Can be done but more info as above required.
  18. WHONOES

    What to Do With a Lot of Salvaged Speakers?

    Mounting a speaker in a closed box is a good place to start. Some form of panel damping such as carpet felt should be glued to the cabinet walls then the remaining volume loosely filled with kapok or polyester wadding. High end speakers would most likely use lambs wool for various reasons. A...
  19. WHONOES

    What to Do With a Lot of Salvaged Speakers?

    You can have a lot of fun and learn a lot playing with small speakers. That's how I started out in the early 70's. If you want to use some online calculators, you will need to know the Thiele - Small characteristics of the units. For the cheap units you have recovered no such data will exist...
  20. WHONOES

    Circuit not working

    In your solution, Q1 could really do with a pull up resistor otherwise when the switch is open, the base of Q1 is left floating and the device could be partially turned on.
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