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Recent content by Thoma HAUC

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    Phantom power for TV antenna amplifier

    Hi BradtheRad, When you say 10x, I suppose you mean 2400 ohms. This gives a 12.7µH inductor. Thoma
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    How fast can i operate PIC184550 ADC?

    Hi xpress_embedo, I would do : * Set up ADC * Select channel 0 * Start conversion * Wait conversion done * Read value from ADRESH:ADRESL * Select channel 1 * Start conversion * Wait conversion done * Read value from ADRESH:ADRESL * And so on... Where is the code for changing channel? Where is...
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    Phantom power for TV antenna amplifier

    Hi, @ SLK001 : It was my fear. But the original broken power supply was a switching mode power supply. Unfortunately, it is not longer available. @ chuckey : Does a 1nF ceramic capacitor do the job ? Can I use a 150nH air inductor for this job ? The 9V is a DC power supply so I can not use...
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    Phantom power for TV antenna amplifier

    Hi, I need to design a circuit that will provide power to a TV antenna amplifier. My constraints are : * Characteristic impedance : 75 Ohm, * Power supply for antenna amplifier : 24V @ 100mA and * Available power supply : 9V @ 1.6A I think I will base the solution on a step-up converter. But I...
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    [PIC] Various official ICD2 schematics

    Hi, I have an old "ICD2 LE" based on a PIC18F4550 for USB interface and a PIC16F877A for PIC programming. I know also about two others versions: ICD2 (P/N: 10-00319, seems not work with w7 64) ICD2 (P/N: 10-00397, should work with w7 64) Are schematics available for the three versions...
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    frequency divider (430Mhz to 10Mhz)

    Hi navyashree, I found for several years a perl script at the following link : https://fractional-divider.tripod.com/ Hope this help. Thoma
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    FPGA and FT2232H (Sync FIFO + JTAG port)

    Hello, I plan to use a FT2232H for fast communication (Sync FIFO mode) with my application in FPGA. I would also use it to update occasionally the configuration memory of the FPGA through JTAG. The FPGA will be a XP2-17 from Lattice semiconductors. I read in the datasheet that when you swith...
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    [SOLVED] Embed a heater in PCB

    Hi TA37, You are right; there is a regulator (PID) that controls the duty cycle to hold it close to the target temperature. Thoma
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    [SOLVED] Embed a heater in PCB

    Mattylad, FvM, This will be another big challenge, because the PCB has to be flood in resin for mechanical reasons. And for the moment, I do not know how to reduce the heat sinking as adding glass wool will be really difficult. Thoma
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    [SOLVED] Embed a heater in PCB

    Hi FvM, My design is powered under 3.3V. I have strong size constraint. I will stack my board as described below: top layer, I will put all my thermo sensitive stuff, layer 2 will be the ground plane (with thermal relief to reduce sinking effect), layer 3 and 4 heating coil, layer 5 will be...
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    [SOLVED] Embed a heater in PCB

    Hi Keith, If I use power resistors, it will be difficult to get a good thermal coupling between heating elements and the components that must be thermalized. Concerning the copper track, I estimate that a 400mm long track and 125µ large has a resistance around 2.4Ω @ -25°C and 3.5Ω @ 70°C...
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    [SOLVED] Embed a heater in PCB

    Hi all, I search some experiences and accounts about embedding a heater in PCB. I need to keep a part of my design at 80°C and, therefore, plan to use a long a thin copper track as heating element. What do you think about this? Thank you in advance. Thoma
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    [SOLVED] RTD and/or TC input circuit

    Hi FvM, I lost track of wires resistance that can greatly impact the over all accuracy. I suppose I have all information to design my measurement circuit. Many thanks, guys. Thoma
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    [SOLVED] RTD and/or TC input circuit

    Hi FvM, Are there any contraindication to use a higher current (200µA)? Thank you in advance. Thoma
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    [SOLVED] RTD and/or TC input circuit

    Hi FvM, Do you think that defining a common mode voltage through a 10k resistor is acceptable? And how large should by the line break detection current? Thank you in advance. Thoma

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