May I know what software you use to design this pcb layout? I saw exactly the same as pcb software which is designed apexaudio.
Can you help me to address a free download
regards
http://www.diyaudio.com/forums/analog-line-level/167363-mic-line-eq-preamps-4.html #32 #35 #37
Here it is,it is assembled but it has 7VDC offset on the output. I´ve done something wrong,and now i am going to seek for a mistake. A few pictures:
Attachments
No mistake found-it works just fine! I was doing it last night in my garake and it must be my multimeter gone wrong due to low temperature (-7 / -8°C) , or there was metal splinter doing some shortcut on his own. I don´t know what was wrong,but it works now. I also found out that i have one NE555,so there will be one more APEX,this time as a protection circuit! 😉 Now the only thing i should do is to learn how to play electric guitar! 🙂 Thanks mr.Mile Slavković APEX , one more time!
Attachments
Quitar Amp
Hello, sir Mile. I build your guitar amp, but I do not know what kind are these capacitors:
In the schematic are given without polarity, but this value seems a tantalum capacitor. I dont know what exactly is ? Please help me, or if it is not important and i dont need to put them. Thanks and Best Regards.
Hello, sir Mile. I build your guitar amp, but I do not know what kind are these capacitors:
An externally hosted image should be here but it was not working when we last tested it.
In the schematic are given without polarity, but this value seems a tantalum capacitor. I dont know what exactly is ? Please help me, or if it is not important and i dont need to put them. Thanks and Best Regards.
Problem 🙁
Hi sir Mile,i cant find exactly 16 volt bipolar caps and i put same with 100volts, which I guess is not a problem except for size. All look normal and final stage work (mean the drivers and MJH11018/17), but my input is line-out, rather than input. In the ''Input'' i dont have any brum and also to pin 3 on TL072. I have signal just on C14 / 33n, and Line-out. The 2 diodes 1n4148 on the input have +/-16 volts. In facts i guess that the preamplifier and adjustments do not work. I dont see any mistakes in the PCB assembly or elements. If you have any idea where can be the problem, I will be happy. Thank you.
Hi sir Mile,i cant find exactly 16 volt bipolar caps and i put same with 100volts, which I guess is not a problem except for size. All look normal and final stage work (mean the drivers and MJH11018/17), but my input is line-out, rather than input. In the ''Input'' i dont have any brum and also to pin 3 on TL072. I have signal just on C14 / 33n, and Line-out. The 2 diodes 1n4148 on the input have +/-16 volts. In facts i guess that the preamplifier and adjustments do not work. I dont see any mistakes in the PCB assembly or elements. If you have any idea where can be the problem, I will be happy. Thank you.
Hi Mile, i cant found 16v/33uf, so i put 100v/33uf, i think that thereis no problem except the size. All look normal, the pcb assembly/elements and final stage work( the drivers Mjh11017/18, but my input is line-out, rather than input. I have noice(brum) on C14/33n and ''Line-out'' - input, but not in ''Input'' jack. I check the voltage in 2diodes 1n4148 and there is normal +/- 16v. In facts the preamplifier and the corections doesnt work. If you have any idea or you see some mistakes on the pcb or elements, please help me. Thakns.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Thank you, mate i will try. I check everything on the pcb and the components, and look fine. Thanks for the advice and i will respond soon if it work to me.
Mile,
have you schematic for 4band active tone control like ML3 Schematic?
On ML3 schmatic which we can modified for 4 band tone control?
have you schematic for 4band active tone control like ML3 Schematic?
On ML3 schmatic which we can modified for 4 band tone control?
Guitar
I dont know what is the sensivity of mic input, but i made and use ML3 for clasic guitar without adapter and the mic input is very very high level and i have little distortion on the high volume. I think the problem is the low voltage in my psu ( +/- 50V) I prepare the zeners to have 15V, and everything work fine. Actualy its quite enough for 100W HIFI guitar amp, and the one corection wich i made is 3 diferent inputs. One with 22k resistance, 33k resistance and the original microphone input with 10kohm. The sound is hifi without any distortions and brums.
Thanks to Apex again.🙂
I dont know what is the sensivity of mic input, but i made and use ML3 for clasic guitar without adapter and the mic input is very very high level and i have little distortion on the high volume. I think the problem is the low voltage in my psu ( +/- 50V) I prepare the zeners to have 15V, and everything work fine. Actualy its quite enough for 100W HIFI guitar amp, and the one corection wich i made is 3 diferent inputs. One with 22k resistance, 33k resistance and the original microphone input with 10kohm. The sound is hifi without any distortions and brums.
Thanks to Apex again.🙂
PS. I mean the 15Vceners on to B500 wich i use with ML3 preamp. The distorion was from the low PSU Voltage without change the default schematic R4.7k to 1.5k. ML3 is universal preamp, and i know i will make more from them. Its easy to build.😛
Hi Mile
can i use 100K pots for the bass mid and treble
pcb is ready,have to put components on it i will post pictures after placing..
can i use 100K pots for the bass mid and treble
pcb is ready,have to put components on it i will post pictures after placing..