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  1. W

    TDA2005 making static noise

    Hi audioguru, I've checked and re-checked the new connections but some how made the opamp's to oscilate, pins 5, 6, 9, 10, 12, 13 has a clear beep on it and the output also. The power amp blocks had a small "buzz", removing the supply jumper away from the input pins solve this issue. No...
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    TDA2005 making static noise

    Hi audioguru, I've changed everything values, tracks etc. When all is ready and i turn it on i could not hear any music at all, but, i could hear a clear, loud, no noise or distortion 1Khz beep  ;D ;D ;D I will do this from ground zero all over again in separated boards, one for the main input...
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    TDA2005 making static noise

    Hi Audioguru, I did some more tests with only one stage, all other stages are out, injecting signa at R36 with all the changes, the sound is like AM radio with noise and stuff, using a 470K in R68 and injecting sound there still the same, lot of noise with sound. Removing this opamp and...
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    TDA2005 making static noise

    Something is wrong, i removed all the opamps and the TDA2005 output is quiet, but still if my hand is near the caps it generates alot of noise. If i touch the 2.200 caps i can hear radio.... I will do it all over again. Any sugestions that i should follow to do pcb layout and avoid this noise...
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    TDA2005 making static noise

    Hi audioguru, I've done the changes, but the circuit start to make sound like a fart  ;D
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    TDA2005 making static noise

    Hi audioguru! I will try your changes  :D Thanks
  7. W

    TDA2005 making static noise

    Hello guys! I want to use a mid-range and tweeter to make a center channel in my car, so i choose to use the TDA2005 plus an active crossover. When i turn the circuit on it has a static noise like, sound like a pink noise to me. So i remove R66/67/68/69 to isolate both circuits, analysing the...
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    How to get better current from LM317?

    Just passing by to upload the last changes, board design, if some one decide to build the project.
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    How to get better current from LM317?

    Hi audioguru, it was a high resistence choke and was the cause of the problem. The LM317 only get burning hot when i set the NET-MD/Walkman to charge the battery because of the current to do it. I did not build this to charge nothing but is working, with a small heatsink it will not shutdown...
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    How to get better current from LM317?

    It was Ldanielrosa. Mine some times made the led REG flash like a HDD everytime the MD lenses was moving. I just remove the choque, add jumper and its working fine, the LM317 just get a bit hot, it will get burning hot when is chargin the MD player batteries.
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    How to get better current from LM317?

    I've found the problem, it was the choke but without the choke i got engine noise, to solve that i add a 1R between the my board and the device. NET-MD and Walkman working fine!
  12. W

    How to get better current from LM317?

    Hi audioguru, The walkman that i use is the old SONY WM-FX822, here there is a nice picture of it: http://www.geocities.jp/sony_transistor_radio/walkman/_index.html It works with one AA battery and gives a nice 8hrs non-stop playback (cassette) and a few days with radio. It uses only about...
  13. W

    How to get better current from LM317?

    I never use the LM317 and this was the first time, i have a NET-MD and old Walkman(cassette) that i want to use in my car, the NET-MD uses 3.0V and the walkman 1.5V, they need about 200ma to work. The thing that i've noticed is that the output of the regulator oscilates too much, at first i...
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    12VDC to 24VAC 4 A

    I don't think that this sound stupid. It needs AC because is the principle of his work. I think that this solution comes with a complete package, not just the swing motor, if some one get only the swing motor, without the controlers, this sound stupid to me because it's the same if you buy a...
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    12VDC to 24VAC 4 A

    At the link they say: Principle When an AC current is applied to a coil placed at right angle to the magnetic field, a thrust occurs according to Fleming's left hand rule. This thrust is directly applied to the piston, which then performs the compression and intake cycles. If this swing motor...
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    Need sugestions about virtual ground or symetric supply for OPAMP

    For thouse interested in design your own sallen-key filters here is a papper from TI (Texas Instruments) that will take you there in seconds: http://focus.ti.com/lit/an/sloa093/sloa093.pdf Very easy, you just need to work your math. ;D
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    Need sugestions about virtual ground or symetric supply for OPAMP

    Here are the changes made, sounds good, testing songs with heavy and deep bass the ambience channel is stable.
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    Need sugestions about virtual ground or symetric supply for OPAMP

    Here are the schematic for the Sallen key filter set for the same 72Hz and Q of 0.5, i will build this in a separate board and play with Q latter.
  19. W

    Need sugestions about virtual ground or symetric supply for OPAMP

    Hi audioguru, I will do some tests with your sugestions and see what it does. Thank you.
  20. W

    Need sugestions about virtual ground or symetric supply for OPAMP

    Hi audioguru, This circuit was design to be used in my car, so i think i am safe from vinil and tapes  ;D The idea is to kill thouse deep bass because it does no good over the ambience channel, i did generate a 0db sine wave from 50Hz to 100Hz and in the ambience channel it get only...
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