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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by semiconductor

  1. S

    line follower robot

    try this link: **broken link removed**
  2. S

    IR Receiver

    First, you have to verify that the transmitter send out signal at which frequency (you can check this by calculating central frequency of LM567, refer to LM567 datasheet). Because, received signal is week so that, after detect the signal, we have to amplify it, then the LM567 do this task, if...
  3. S

    power supply

    Your transfromer would be 220VAC to 15VAC (after Bridge rectifier, the output DC voltage will be multiplied by sqrt(2)) Then, you can use LM317 to regulate your output DC Voltage. If you need more current (2A), you can add a power transistor, such as 2N3055 or 2N2955 (check in datasheet to...
  4. S

    can someone help in finding a programmer for the AT89C52?

    If you want to do it yourself with singleside PCB, try this link. I've just done it and it works well **broken link removed**
  5. S

    I need your help!

    I was assigned a new project. This is the content of it: We have 10 LED, each LED has a switch. When no switch is pressed, each LED is light up in every second, for example, - at time t LED i is on then at time t+1 LED i+1 is on and LED i is off When switch i is pressed, LED i is on...
  6. S

    URgent: ir controller

    May be useful to you try this link **broken link removed**
  7. S

    Some questions related to LM567 (tone decoder)

    The PIN 3 is connected to PIN 5 between Resistor 2.5K and capacitor 0.004 mfd. I'll post my schematics later if possible!
  8. S

    Some questions related to LM567 (tone decoder)

    Some questions related to LM567 (tone decoder) I'm working on a project. My duty is that: I have to detect a signal radiated from an IR LEDs. I use the SFH506 to demodulate the modulated signal (carrier frequency is 40kHz). I know the information frequency, it is: 40 Hz. I have to detect this...
  9. S

    I really need your help!!!

    I'm working on my own project: automatic tap. When we put your hands in the sink, the tap automatically turns on and the water flows. One of my goals is that, sensor is as cheap as possible. So I decided to use IR sensor (the cheapest way!!!). - The IR sensor comprises 2 modules: The...
  10. S

    Can someone help me?

    I'm working on a project. It's basic one: POWER SUPPLY It can provide output voltage: 24VDC, output current: 4A. I use LM317 regulator, in association with op-amp LM301. This circuit diagram is included in LM117 datasheet, with a pass transistor (I use 2N2955) (I downloaded it from somewhere...
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