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  1. WHONOES

    Just When I Thought it was Going to Be Easy

    Can you post a circuit diagram of what you are doing?
  2. WHONOES

    12v DC to 24v 50Hz AC square-wave 500mA: transformer & transistor?

    If you are using it to run some LED's then you should be OK with a d.c. supply. LED strings that run on 12V d.c. are available. Can you provide a link to the LED string you are proposing to use?
  3. WHONOES

    Relay or MosFet to switch a 12V signal?

    Almost. R1 is your load and should be connected directly to ground and not go through the switch. The value depicted is fictional and is only there to show where your load goes. Does that make sense. Other than that you are correct. Note, both the grounds should be connected together, if one is...
  4. WHONOES

    Relay or MosFet to switch a 12V signal?

    See the attached circuit and plot. If have understood you requirements correctly, the attached circuit should satisfy them. Referring to the schematic, Q1 provides the switching function for you 12V signal. R3 connected between gate and source keeps it switched off. When S1, shown on the...
  5. WHONOES

    High Frequency VCO -- Capacitor bank

    A Voltage Controlled Oscillator will need a capacitor or two in it.
  6. WHONOES

    12v DC to 24v 50Hz AC square-wave 500mA: transformer & transistor?

    What are you hoping to use it for?
  7. WHONOES

    Marantz SR 63 static noise on left channel

    Sounds like a noisy switch somewhere. Switch contacts tend to oxidise over the years unless they are Gold plated. They are generally plated with silver or an alloy of silver and something else.
  8. WHONOES

    Boost Convertor using LT3757

    If you are using the values shown on your simulation, then feedback resistors R5 and R6 are incorrect. With the values shown, 220K and 5K the gain of your circuit is 220 / 5 +1 which comes to 45. The reference voltage on the LT3757 is 1.6V. 1.6 x 45 is only 72V. For correct gain to achieve 180V...
  9. WHONOES

    Speakers/Subwoofer

    Reasons for Electrolytic Capacitors blowing up are often reverse polarity (connected the wrong way round). Failure is usually fairly prompt in this instance. Another reason is if the rated voltage of the Cap' is significantly below the power supply voltage. In this instance failure can take much...
  10. WHONOES

    Demodulating differential signal.

    I see that your own design amplifier uses no feedback, as such it is operating open loop. Your gain bandwidth product would then be divided by the gain factor of 68dB which is approx' 2511. Therefore the available bandwidth will be 17MHz / 2511 which yields 6.7KHz. Could that be part of your...
  11. WHONOES

    Speakers/Subwoofer

    Check the the "Mute" and "Standby" voltages on pins 9 and 10. They need to be above 3.5V for the amps to function any lower and it they will not. There will be a switch or similar somewhere on your equipment to control same.
  12. WHONOES

    DC Motor Driver Problem

    I notice that it has a fuse on board. Is it intact?
  13. WHONOES

    Seeking Front Panel Silkscreen Alternatives

    I print panels on a sheet of paper then laminate them, cut them out and fix to the panel with double sided tape. It works really well and panels up to A3 (or even larger) can be created. They are hard wearing and can be replaced if needs be.
  14. WHONOES

    Boxed In- why doesn't it work when in the box

    Why don't you put it all into one of the plastic boxes you mentioned in the previous thread and see if it works?
  15. WHONOES

    Pioneer SC-1227 A/V Receiver issue ... need some help ...

    Do you have a complete schematic without anything over the top of it.
  16. WHONOES

    Pioneer SC-1227 A/V Receiver issue ... need some help ...

    Being a Class D amp. the output Mosfets should be identical. Can you see if either of the Mosfet gates are switching?
  17. WHONOES

    Studio Active Monitors Speaker/Woofer Damaged buying equivalent one instead of original?

    Getting the correct drive units matters a lot. The cabinet containing you speakers has been designed with that specific unit in mind. For a ported speaker the volume of the cabinet and the diameter and length of the port are critical. The pertinent data that would have been used in the design...
  18. WHONOES

    Pioneer SC-1227 A/V Receiver issue ... need some help ...

    Have you checked for a large d.c.offset at the output. A lot of amps have a circuit to check for this and will shut down after a few seconds if there is one. Anything more than 100mV or so will constitute an offset error. If you are going to check for this make sure that the volume control is...
  19. WHONOES

    Passive equalizer

    You will need some source resistance otherwise you are just shunting the output of what ever it is connected to. Are you averse to using an active circuit?
  20. WHONOES

    Resonance

    Why don't you use a simple tuneable band pass filter using an opamp?
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