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  1. P

    IC EQUIVALENT

    In one of my projects IC TL274cn was used. This IC is not available in my city and also in online sites where I checked. One of the Parts Dealer referred to as TL064 which can be used instead of TL274cn. TL274cn is cmos and TL064 is jfet. And also in TL274cn "in" goes to v- whereas in TL064...
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    Computer Fan

    I have a computer fan which suddenly started to run slowly. I want the rotor to be rewinded but the Pcb has 3 connections whereas the rotor has 4. Can anyone help me how the winding is done for three connections & what is to be done with the 4th.
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    DIGITAL ESR METER WITH IC ICL7107

    Hi Does anyone constructed an ESR Meter with micro controller and that also a simple one. If so, please share the circuit and if the parts are available I will proceed. And also have the chip programmed. Thanks
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    DIGITAL ESR METER WITH IC ICL7107

    I came across one ESR Meter by Jim Gregellas. Schematic is uploaded but it uses micro ohmeter. Will this work?
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    DIGITAL ESR METER WITH IC ICL7107

    Sorry to trouble you all there. The IC TL084 is mentioned erroneously. It is actually TL064 that I have with me and I wanted to know whether this can be replaced instead of TLC274cn which is not available in the market. And another doubt in my mind is whether this circuit will work or not...
  6. P

    DIGITAL ESR METER WITH IC ICL7107

    I did not get some of the important parts, where I reside and also online stores in our country. The components I did not get are : 1. IC TLC274cn 2. BAT43 3. P6KE6v8ca I got recommendations for the replacement as : 1. IC TL084 for TLC274cn 2. IN5819 for BAT43 3. P6Ke10A for P6KE6v8ca Are...
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    DIGITAL ESR METER WITH IC ICL7107

    Thank you Sir for your response The circuit diagram order is as it is. I am not touching or changing the order of the display's but I am having doubt that since it is shown as ones, tens, hundreds, thousands in the diagram - LD1, LD2, LD3, LD4. In the placement of displays in the PCB it will...
  8. P

    DIGITAL ESR METER WITH IC ICL7107

    Sir, I thank you for the comments. I also had the same doubt of the resistor of 47k 1w. And the order of 7 segment display (I did not get you) will be from right to left i.e. LD4, LD3, LD2 & LD1. Is it so.
  9. P

    DIGITAL ESR METER WITH IC ICL7107

    I came across this ESR meter with IC's - ICL7107, 555, 4049, TCL274CN, & other common parts. In the schematic diagram (attached) the four 7 segment displays are mentioned in sequence as LD1 (ones), LD2 (tens), LD3 (hundreds) & LD4 (thousands). In the PCB or in veroboard, etc the sequence...
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    MOVING COIL IN ANALOG MULTIMETER

    I want to replace moving coil in one of the analog multimeter. How do I find the suitable one to be replaced and work as before. There are many panel meters available in Volts & Amperes. Will these suit in the multimeter. Is there any indication of finding a suitable one to fit in a...
  11. P

    REPLACE NI-CD BATTERIES WITH LI-ION TYPE

    Sorry I did not see the board. Herein with 4s BMS board the wiring that I will be doing is shown here. If this is the correct way I will go ahead otherwise I will seek your suggestions put forth by you. How will the wiring look like with 2s bms board. Please clarify.
  12. P

    REPLACE NI-CD BATTERIES WITH LI-ION TYPE

    I will be wiring 4 18650 cells of 2500 mah in 2S-2P way. As shown in the attached file. I will be using 4s bms board as shown. The wiring that I will be doing is as per the diagram drawn by me. Is it the correct way to wire the cells with 4s board. If there is any improvement / mistake...
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    Reico Sakura Multimeter

    Thank you for the reply. The screw is not loose or disengaged. But it is sufficiently tight enough to enable the needle movement. I tried and turned the screw but was not useful since the needle stops mid way while testing. This meter uses only 2x1.50v cells and there is no 9v battery inside...
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    Reico Sakura Multimeter

    I have the Reico Sakura Multimeter. The front glass pane is broken. Of late this tester is not getting adjusted to zero ohms. The variable potentiometer of 1K was defective and hence replaced with new one. But still the working of needle movement towards zero is not full. It comes towards...
  15. P

    REPLACE NI-CD BATTERIES WITH LI-ION TYPE

    I will be using BMS for the li-ion cells to protect them from overcharging, etc
  16. P

    REPLACE NI-CD BATTERIES WITH LI-ION TYPE

    I removed 6 cells from old laptop. Some of them were in the range of 3,65, others showing 2,45. After charging these it improved a bit by 0.35v to 0.5v. but the drill could not take on with 2 cells & voltage dropped back.
  17. P

    REPLACE NI-CD BATTERIES WITH LI-ION TYPE

    I have one "KRAFTtech" drill machine (model CDP02CN-1) wherein it has 5 ni-cd cells of 1.2v & 1200 mah each. Now I would like to replace these cells with Lithium type cells (18650) of 3.7 volts. Since originally it works with 6v, Lithium cells required will be 2. Now the question is - should...
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    IC 3130 REPLACEMENT

    The above circuit is "Simple Micro Ampere Meter Circuit" convert & help in measuring small currents in five ranges: from 1 µA to 10 mA. . For example if a 1 mA meter is used, the total resistance (the sum of the resistor R and the coil resistance Ri of the meter) must be 1kΩ. If a 100 µA meter...
  19. P

    Lithium-Ion Battery Charging

    I have with me some charger modules with protection from overload & undercharging. I also have few BMS. So for charging more than 2 cells, we charge through BMS and for single cell charging only one module is required. thanks for the replies I got.
  20. P

    Lithium-Ion Battery Charging

    For charging a litiumion Battery of 3.7v capacity, we use charging module(s). I use a small and convenient size charging module with IC TP4056 module, which protects against overload as well as under charging. Now do we need to connect a BMS to this charging process. What I mean to say is ...

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