Pro Audio Design Forum

Here's the link to bruno2000's build of the mic preamp: http://www.ka-electronics.com/images/pdf/WAYNE17A.pdf

Regarding the choice of topology: is there any major disadvantage with your first circuit, other than the usage of one more opamp? As a matter of fact the pcb layout is actually ready to send to the fab... Go for it. I've PM'd bruno to post his sch which is being used in his remote truck. It's the ...

Volker - Thanks for re-visiting this. I'm not sure page one's figure is the final word. Having said that, bruno2000 used it with good results in his 12-pack preamp. http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=7&t=339 I think we may want to try this one instead. ricardo had me re...

I realize that this thread has veered OT, but: Check out the 1K input series resistor in the NE5532 test circuit. This figure is from ON Semiconductor. My 1981 Signetics data sheet also shows the same circuit. (No surprise.) https://www.ka-electronics.com/images/jpg/NE5532_Voltage_Follower_Test_Circ...

There's a nice tear-down of a Samsung LED lamp by Margery Connor here: http://www.edn.com/blog/PowerSource/41611-Samsung_LED_light_bulb_teardown_includes_objective_dimming_numbers.php http://blogs.cancom.com/elogic_1470000147/files/2012/02/samsung-pcb-before_400.jpg This one uses the Link Switch LNK...

Looks like there may be some additional reverse log/reverse audio taper options available. Bourns "left-handed" 24 mm brochure: http://bourns.com/data/global/pdfs/Bourns_SC1103A_PDB241-GTR_FPB.pdf Bourns Pro Audio Home Page: http://www.bourns.com/proaudio/pamm.aspx Both my daughters play g...

Thanks Doug.

Note: This board is no longer available and has been replaced by the Dual Class-A II. http://www.proaudiodesignforum.com/forum/php/viewtopic.php?f=7&t=825 Update 1/5/2015 : Apparently not all BD139/BD140s are insulated. The Fairchild parts shown in the BOM do not require insulators. Oddly the da...

A simple tone control from Dereck Bowers: http://electronicdesign.com/article/analog-and-mixed-signal/Simple-Circuit-Offers-Single-Adjustment-Tone-Control.aspx "Simple Super Ripple-Eater Also Cleans Battery-Based Supply" http://electronicdesign.com/article/power/Simple-Super-Ripple-Eater-...

Here are some recent Design Ideas which may be of interest to our readers: "Use a Boost Regulator beyond its rated voltage" shows an 11-14V input to 48V 100 mA output. Might be useful for phantom if it could be made quiet. https://www.edn.com/design/analog/4368842/Use-a-boost-regulator-be...