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  1. D

    treble control centre frequency

    Several approaches : 1) Cascade second order sections 2) Use Chebyschev LPF with G (Q) peaking 3) Resonator bank summing filter approach, sum a LPF and a BPF filter response You will have to do some experimentation. Regards, Dana.
  2. D

    treble control centre frequency

    Hand draw a pic before and after ....
  3. D

    treble control centre frequency

    Again a sim changing the pot from 0 to 100% : Here caps change to get center closer to 6 Khz : Regards, Dana.
  4. D

    treble control centre frequency

    A sim changing the pot from 0 to 100% : Regards, Dana.
  5. D

    2 appliances 1 switch

    What are the power requirements for each ? Manufacturer name and model number ? Regards, Dana.
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    Electric circuit analysis

    Post your LTC File. Regards, Dana.
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    Constant current source

    Its actually to turn OFF MOSFET. And I am not sure why its needed as the OpAmp will drive to the Vss rail, so curious myself why its there. Regards, Dana.
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    Electric circuit analysis

    C1 would slow rise of power when V1 is turned on, but once charged effectively out of the circuit as R1 R2 would set the V. Varying C1 from 1 nF to 100 nF. Regards, Dana. Regards, Dana.
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    Constant current source

    R9 allows the tiny bias current of U2A inverting input to flow, a DC path, so OpAmp output stays in linear region, eg acts as a follower at DC so the OpAmp output does not saturate into a rail depending on sign of bias current. And as crutschow points out is part of the compensation loop along...
  10. D

    Constant current source

    R5 is to decouple the Cload presented by the MOSFET and its Miller C. This helps to increase the phase margin due to Zo of the OpAmp and the MOSFET C. R7 provides a DC bias return path for the OpAmp. Regards, Dana.
  11. D

    Thermistor sensor

    Take a look at this ap note for getting high res - https://www.infineon.com/dgdl/Infineon-AN66477_PSoC_3_PSoC_4_and_PSoC_5LP_Temperature_Measurement_with_a_Thermistor-ApplicationNotes-v10_00-EN.pdf?fileId=8ac78c8c7cdc391c017d07255c514a3b Regards, Dana.
  12. D

    Thermistor sensor

    Here are a couple of ap notes on thermistor measurement. You can ignore the device specific info, as general principles apply...
  13. D

    STM32 Heating

    Is this part in latchup ? Possibly due to power supply sequencing not correct, or out of spec pin V per below..... Part dissipates > 1W, so not exactly cool to the touch unless heatsink. Regards, Dana.
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    Common Emitter Amplifier - and Diagnosing Problems with an Oscilloscope

    The 10 uF goes from the + supply rail on the protoboard to the negative (ground) rail on the protoboard. The sine out has a high freq noise on it, using your time/div on scope increase it so you can measure the time between two adjacent peaks of the high freq and calculate that freq, what is it...
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    Common Emitter Amplifier - and Diagnosing Problems with an Oscilloscope

    Your ground lead to breadboard from UNO R3 is on upper ground rail, but your circuit is all tied to lower ground rail, you should move that ground to the lower ground rail. The two red and two blue rails are not tied together in the protoboard unless you put in a jumper red to red, blue to blue...
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    Short pulse output

    If you have used a 4 function calculator over the years than you have been programming, in your head. You know when to create a variable, to store a temporary result, you know order of operations, you know what an operation is...... The block programming languages getting pretty good. Here is...
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    Temperature Display LM35 on 7 Segment

    1) Post schematic 2) Pic of your prototype setup 3) What do you observe on the display ? Regards, Dana.
  18. D

    Short pulse output

    Here is a simulation showing a 10 mS slow ramp 0 - 5 V being applied to a CMOS gate input (with no Schmidt input) and 50 mV RMS of noise super imposed on that input. As you can see it has a very unstable output as its input passes thru gate threshold point (~ 2V) : Regards, Dana.
  19. D

    Short pulse output

    What is the tolerances you are seeking for the 2 sec pulse ? Do you care about T & V and Device tolerances for the pulse above ? If you use CMOS gate logic to create the time delays preference is to use a Schmidt input device, like 74HC14, to insure you dont get this in your pulse production ...
  20. D

    Short pulse output

    I get the impression that the difference between 2 seconds and 1 or 3 seconds would be relevant. Especially since OP has stipulated the 2 sec pulse width he wants. Using the right part for the job is always the right way. For all we know he may need a +/- 5 ppm pulse, even my solution would be...
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