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Recent content by Jadeit

  1. J

    STM32F3 Timer1 negative output delay?

    Timers in the STM32F3 processor have TIMx_CH1 and TIMx_CH1n outputs I have simple questions. Is there a negative output from the same source as a positive one by inserting the inverter or not? In other words, are the negative and positive output of the reference clock synchronous or is there...
  2. J

    Instrumentation Amplifier

    I have in front of me a circuit in which the instrument amplifier is assembled from three amplifiers in the LM324AD, resistors are SMD 1 or 0.1% accuracy.+12V power supply, the gain can be adjusted with a multi-turn trimmer 5k in the range of 60 to 600. The amplifier reads the two input voltages...
  3. J

    7 channel Low side driver .. TPL7407L/ULN2003 replacement

    OK 5W load on 12V is current 420mA, TI in the TPL7407L datasheet does not list the Rdson transistor in the IC, it uses marketing words like " Power Efficient (Very low VOL)". According to the Figure 1 is Rdson on 70C 2Ohm. For current 420mA is power dissipation 350mW, for 3 active transistor I...
  4. J

    7 channel Low side driver .. TPL7407L/ULN2003 replacement

    I need to control 6 solenoids 5W 12 or 24V each. A maximum of 3 can be connected at the same time. So far we have only used a 24V solenoid so I used the TPL7407L Unfortunately, 12V solenoids require twice that current and the TPL7407L cannot be used. Is there any transistor array with lower...
  5. J

    Heating resistor for an electric burner?

    I want to make electric burners for modeling tricks like igniting a rocket engine. An SMD resistor is taken, the supply wires are connected and the whole thing is covered with an incendiary mixture with a high burning temperature. When a large current passes through the resistor, the resistor...
  6. J

    China motor 230V 6IK 180RGN-CF

    OK today we had some time so I removed the engine from the machine and measured it with a more sophisticated measuring device. Yesterday I measured it on the machine and using a cheap multimeter. I have a motor on the table, it looks like new, there are three wires coming from the motor, black...
  7. J

    China motor 230V 6IK 180RGN-CF

    I have a 180W Chinese motor 6IK 180RGN-CF with the gearbox and this speed controller. The engine stopped turning There was a cracked and leaking 10uF 450V capacitor in the control unit,. The speed control itself is with a triac. The motor has three wires, black, red and blue, and two white wires...
  8. J

    3-5kW ZVS Induction Heater?

    5000W/5KW ZVS Induction Heater something tells me that it will be 3 or 6 in parallel
  9. J

    3-5kW ZVS Induction Heater?

    What do you think of these Chinese toys? 3000W 55A ZVS or 5000W ZVS or 3000W ZVS kit A At first glance, it is an ever-repeating design that can generate frequencies above 60kHz in one channel at approx. 48V approx. 2500W. What is my point? Yes, it is related to my question about the PID and the...
  10. J

    Muffle furnace control- PID etc?

    >applicability of unusable thermocouple type K The literature commonly states that it can be used up to 1250 (1260) C. If you look at the tables, you will find that they contain voltages up to 1373 C. Around 1400C, this type of cell starts to melt. My conclusion, the thermocouple type K can...
  11. J

    Muffle furnace control- PID etc?

    OK i will take it step by step and from the end. Why more types of thermocouples? For me, the primary reason is that I have K-type thermocouples in a drawer and up to 1250 is enough, the question is what up to 1350. If not, I replace it with S, B comes into consideration, but it does not...
  12. J

    Muffle furnace control- PID etc?

    thank you for the responses >temperature controllers with display are available for a few 10$. Yes and no. the cheap ones usually do not allow - the use of different thermocouples - cannot or it is difficult to enter the required temperature development curve - they have one or two segment...
  13. J

    Muffle furnace control- PID etc?

    I am building a laboratory muffle furnace for heating molds and melting. Temperature up to 1350C, power 4kW, heating, heating wire kanthal A1 approx. 0.5 kg,, izolation 10cm AlO3+SiO2. Temperature measurement, thermocouple, for now K, later S or B. such a classic, nothing special- Now I'm...
  14. J

    Transformer for LLC converter?

    Here in the discussion, I came across an LLC switched converter and I have no idea what a transformer with LL inductions looks like. Here is a picture of a converter with details of a transformer and a resonant circuit. The transformer is marked as TE65037, do you think it is the core of...
  15. J

    5V to 400V DC/DC switching PS for GM tube - high efficiency

    For interest, here are other resources for the GM tube.

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