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Recent content by AnalogKid

  1. AnalogKid

    Line follower robot without a microcontroller

    That is the same circuit on two different sites, and the circuit has issues. 1. This circuit places a large reverse voltage across the Q1 and Q2 base-emitter junctions. IIRC, this voltage exceeds the datasheet limits, and will lead to device failure. 2. The relay coils *must* have...
  2. AnalogKid

    headphone amplifier with microphone input

    A bookmark is a local shortcut, not the actual file. As you can see from the "C:" in the link you posted, the file is located on your hard drive. If you are trying to post a document such as a datasheet or app note, find it on the web and post the URL. ak
  3. AnalogKid

    headphone amplifier with microphone input

    That looks like a link to a file on your computer, not the innergoogle. Also, I know that the 2822 datasheet shows them after the coupling cap, but the way more common location is what is shown in you LM386 schematics. This is partly to keep the coupling cap characteristics from affecting the...
  4. AnalogKid

    headphone amplifier with microphone input

    The Zobel networks (R3, R4, C6, C7) should come before the output coupling capacitors. What are the purpose of C11, C12, R7, and R8? Also, traditional schematic signal flow is from left to right, not right to left U-shaped. ak
  5. AnalogKid

    headphone amplifier with microphone input

    Both 386 schematics have only one channel, and nothing at the input to combine the L and R of a stereo signal into a mono output. To have outputs for two persons, won't you need two volume controls? Everything you have mentioned so far certainly is doable, but the size of the circuit increases...
  6. AnalogKid

    headphone amplifier with microphone input

    Velleman is usually a decent kit company, but the NE5532 has a minimum power supply voltage of 10 V (or +/-5 V), not 4.5 V. Are you looking for a circuit to hand-wire on perf board, or a module / kit to purchase? ak
  7. AnalogKid

    headphone amplifier with microphone input

    So, tell us your desires. ak
  8. AnalogKid

    headphone amplifier with microphone input

    Delete
  9. AnalogKid

    ac current limiting

    No, you don't. Charging lithium batteries is more complex, and *much* more dangerous, than charging other battery chemistries. Also, charging a string of them in series is not the best way to do things. Variations in aging of individual batteries causes uneven charging, where some batteries...
  10. AnalogKid

    Simple LED Analog Clock Idea

    Only if it is guaranteed that only one LED will be on at any given time. Also, this technique puts a reverse voltage across the off LEDs, Because the circuit voltage is only 5 V, this is not a problem. In a 12 V circuit, the reverse voltage could be great enough to cause reverse breakdown of...
  11. AnalogKid

    Simple LED Analog Clock Idea

    A minor nit. I would go with only one orientation for all resistors. Consider one or two vertical columns of shift registers down the center of the board, and two vertical columns of 30 resistors each outside the shifters; very much like your schematic layout. This will make things easier to...
  12. AnalogKid

    Why can't I breadboard this oscillator?

    In that context - which we know *nothing* about - what is it you are trying to achieve? (both practically and electronically) ak
  13. AnalogKid

    Curved lines in PCB design

    Nigel - it looks to me like everything can be done with a single-sided board; no need for any copper on the component side. Did your post mean to say that the copper pour is on the bottom (typo)? If so, then . . . Leaffraun - Please clarify your question. Are the copper traces on the same...
  14. AnalogKid

    Photo interrupter Connections

    Without knowing the voltages / circuits connected to pins 7, 6, and 2, it's kinda hard to say. ak
  15. AnalogKid

    how do we find the period?

    Because that is the length of one cycle. If a waveform or chart has a repeating pattern, and each pattern is the same, then the period is the time from the beginning to the end of one pattern. That is the agreed upon definition, and has been in place for way over a century. In electronics, a...
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