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  1. W

    Doubling 7805 regulator current is effective?

    Man, we dont have a resistor of such low value here, the lowest value that i could find is 1 ohm. The main idea of using two transistors is to let then work as cooler as possible, because this circuit will be in the hand of a 7 years old kid in a closed metal box, even if i install this inside...
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    Doubling 7805 regulator current is effective?

    Man, to see my nefiew cry is heart breaking. :-\ He cryed alot when i said that i won't do it. So here we go again.... I know that switching regulators can do this job well, the problem is not how to build because there is alot of books about it, the realy problem to me is to get my hands on...
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    Doubling 7805 regulator current is effective?

    I was afraid of that, so i will have to say a BIG sorry also to this project because with the heatsink, board and transistor the circuit can be bigger than PSP. :o Thank you Audioguru.
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    Doubling 7805 regulator current is effective?

    Hello again guys :D My nefiew has a PSP, here we go, so he wants to play games in his father car without running out of battery. I know that there are alot of cheap adapters to do this for about less than $10 bucks, but here at Brazil is not so easy to get this stuff with the same price, and...
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    CD4049 switching failing to switch

    Hahahahahahaha. I have a Palm that does this for me, to remember my wife birthday and stuff ;D ;D
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    CD4049 switching failing to switch

    Hi Audioguru, Thank you for your help, i will try the 4069 instead. About the 4053, imagine a audio selector with many inputs and every time you turn on your system you enjoy listen to the LP connected at input number 6, i think is more confortable if the device keep it's settings so you don't...
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    CD4049 switching failing to switch

    Hi Audioguru, The push button is connected at J2, yes is what i have, but the output not always alternate it fails many times. The output of 4049 is connected directly to pin 9/10/11 of CD4053. The 555 circuit is just a test for the CD4053... but for my needs it not work because the 4053...
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    CD4049 switching failing to switch

    Hello guys! I'm using a CD4049 to make the CD4053 switch change, so you can hold the CD4053 switch position when you turn the circuit on, but some times fail and i have to press the switch button a few times and looks like is not precise, schematic bellow. I have made a few other types of...
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    How to smooth the audio switching pop or spikes?

    Hey Audioguru, is nice to talk with a guy like you because every mistake i do you say "don't do it, i've done it before"  ;D 30 year ago it must be a very interesting year to live in, i was born at 75 so i wonder how it wolud be to enjoy the 60's, Elvis Presley, ABBA shows and so on. Today kids...
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    How to smooth the audio switching pop or spikes?

    You are right, here at my mini-lab it works ok but the pioneer has a 5v output and mess up everithing, diode removed :P So, i've played with the levels and make tests in my car, so the R1/2 value now is 62K. Few more samples, you will enjoy this one ;D Download 5 Download 6 Download 7
  11. W

    How to smooth the audio switching pop or spikes?

    Cathode at OPAMP pin 3 Anode at R6. I'm still messing around to fine tune this ;D
  12. W

    How to smooth the audio switching pop or spikes?

    Don't challenge me, i love a challenge ;D So, circuit is fixed, return C8 to 100uF (bye noise), add a 4148 diode before R6 (OPAMP pin 3), and i play a bit with the levels by changing R1/2 values (still messing around). So check now what i've got ;D DOWNLOAD 3 DOWNLOAD 4
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    How to smooth the audio switching pop or spikes?

    Ok, hold on a minute, dont go any were ;D
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    How to smooth the audio switching pop or spikes?

    Hey, let's get a patent of this before some one do, we've build a echo machine without a echo machine  ;D Joking  ;D This echo effect is coming from the OPAMP, months before i design the board the way it is now, i've tryed to bias all together the way you said and had the same problem, i get...
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    How to smooth the audio switching pop or spikes?

    Hi Audioguru, Changes made, i removed R17/18/32/33 and capacitor C15/17, joined R21/22/26/27/28/29 to R6/C8 point,  added 4 more 1M bias resistors at each output and joined then also to R6/C8. Upgrade C8 value from 100uF to 470uF. The "pop" is not gone but is in a level so low that you can't...
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    How to smooth the audio switching pop or spikes?

    Hi Audioguru, Thank you! Back to design board.....
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    How to smooth the audio switching pop or spikes?

    Hi Audioguru. 1) The first voltage divider is made to make the OPAMP work with non symetric supply, as you suggest me at the time to do it (R12/13 C5). The main problem that i've faced with this is the cross talking effect when, if, i dont use the other dividers (R17/18 & R32/33) maybe...
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    How to smooth the audio switching pop or spikes?

    Hello guys, long time no see! I've done a audio bypass switch using a pair of CD4053 and a CD4049, the two 4053 are biased with 1M Ohm resistors at the input and the 4049 are build to generate signal to the CD4053. All works fine, no noise (thanks god) but when i change the switches i can hear...
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    Creating a perfect PCB with toner

    Sorry but that is not my page ;) Yes, i do use magazine paper in my printer, just cut the paper and glue or put some tape to fixate the page OVER the normal A4 printer paper.
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    Creating a perfect PCB with toner

    Hello! I've done a few more boards using this magazine paper, and it works like a charm. I think i've about 30 or 40 boards every and each one perfect. Also works fine to make component map.
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