Mic, Line, EQ... Preamps

[karachay]

Here's mine.

ty mr. Terry

 

[viki_v2]

12dB/oct activ X-over with balanced input and outputs for subwoofer (LO),satelite(HI) or full-range(FR). X-over adjust 50-250Hz, and level for satelite (HI).

Hello Miles
How does this circuit work. How do i use this circuit.

 

[apexaudio]

TB7

 

[SAMCPI]

schematic

TB7

Hi Mr mile...
thanks for this eq.
can you send schematic for this?

 

[Gurpreet Turna]

In this thread I will post preamps, EQ, active x-overs, VU...
ML3 is Mic/Line XLR preamp with three band EQ +/-20dB
PCB size 100x40mm
Regards

Hello Mr. Mile I want to use PT2399 delay time echo repeat circuit with ML3, but I can't find proper PT2399 circuit. Please post pt2399 or any other delay time echo circuit.
Regards
Gurpreet

 

[doityourselfamp]

Apex Equalizer

EQ10

i want to use 10k pot for this equalizer
is it posible?
how can i use it ?

 

[bawang]

Location of Crossover

PCB size: 60x50mm

Hello Mr Mile, I am constructing your XL2 subwoofer crossover based on your given PCB and component layout. What is missing is the schematic.

I want to ask, whether this crossover is to be placed before the preamp or after the preamp. I would like to put the XL2 after my preamp, using a paralleled output from my preamp, as this would allow the main Volume control to adjust both the levels to my full range and subwoofers simultaneously.

Does the XL2 has any gain? I am concerned about overloading the crossover.

Thank you very much.

 

[clpk]

First of all, thankful for the published schemes. Is it possible to use this preamp in conjunction with this tone control? I have an old chassis with 100k potentiometers, is it possible to use them here, if possible, what changes should be made?
Thankful

 

[tnvijay]

Stereo tone control with +/-10dB bass and treble adjust.

Mr.Mile,
How to modify this board for more boost +/- 20dB? Will changing the pot from 22k to 47k or 100 k improves the boost? I have been using this tine control for many years,and i should say,this is one of the best tone control circuits. It has got no midrange modification when boosting treble.Also, its perfectly neutral when pots in mid position.I have some usb mp3 modules,which needs more bass and treble boost, Can you please suggest me how to use the board for increased boost?
Thanks in advance

 

[Hicoco]

I would like to ad a Balance Pot to the P30zf. What is the best value and connections that you would suggest to follow your original design ?
Do we have also to change value of the volume pot and resistors around ?
Thanks

 

[jongjava]

Hi Apex, do you have diy schematics collection, of preamp 2.1 for home use?
I 've searched all in this thread, but only found version with input balance.
Thanks

 

[karachay]

hi mr mile

for the guitar amp, can i use j201 for 2n5638?

 

[Lipun]

Mile sir, do you have circuit, sch, PCB for 31band equalizer mono or stereo

 

[karachay]

Hi Mile,

I changed out the resistors. No change in the oscillation. I checked and I see the oscillation at the line out so it is likely in the front end. One thing of note. I have +15.60v, -15.18v on the ICs. Can this me causing this?

hi mr terry and mr mile,

i finish guitar amp but i read +/-17.4v at tl072. is this problem for this amp?

my rail voltage 28vac.

 

[still4given]

Sounds a little high considering the 16V zener but I don't think the TL072 will mind.

 

[karachay]

thank you for answer mr terry.

zd2 and zd3 16v zeners have 17vdc and at zd4 22v zener have 20vdc. and at the 0R27 5w resistors have 0,7mV

do you think it will be problem?

 

[karachay]

and speaker output red and black connectors have 4vdc 🙁((

ah i forgot i use bc547 for bc550. i cannot find bc550 the dc voltage at speaker out can be for that?

 

[still4given]

Obviously that is a problem. You will need to sort that out.

 

[still4given]

and speaker output red and black connectors have 4vdc 🙁((

ah i forgot i use bc547 for bc550. i cannot find bc550 the dc voltage at speaker out can be for that?

BC547 should be fine. What measurement are you getting from TP1 to TP2? Should be around 14mV.

 

[karachay]

its working. i dont connect JB3 and JB5 when i look on schematic i see signal going on that jacks. so i just short them and then amp singing. dc voltage at speaker out gone too cause of JB5 taking ground to speaker. i am soo happy for this 😀😀

but tone controll is not enough bass i think and i dont think this giving 100 watt. any one know how can i calculate it withouth scope???