Just finished mine, and it's working right out of the gate thanks to the help I received here. Lots of headaches along the way with this one though. If you're looking for a "fun" build, you might look elsewhere, like Dany's U87, IMO.
Frank00 said:Hi guys, probably a dumb question, but is this Mouser part a suitable alternative to the BC547B transistors in the BOM (those are out of stock)?
If you look real hard at Dany's pcb pdf, the switches kinda make sense. His mic schematics are really tough to read and somewhat cryptic. I.e.: no capsule info, or AA goes to A on schematic, but It isn't labeled there, you have to sort through the build photos. Thankfully the build photos are helpful!bxershrts said:Thanks for your reply Duantro.
I have a few more questions about wiring the cinemag 13101 to the pcb and the correct locations.
On the pcb can the terms be defined to me.. what is :
bck = backplate? Yes
LC = Large Capsule? Low Cut
s1b = ? These are for headers and jumpers instead of a switch
s1a = ? These are for headers and jumpers instead of a switch
Pad = is this an internal switch that can be added? Yes or jumpers
on = shelf? also is this an internal switch that is added? Direction for switches or jumpers for pad to be enabled
FD = front Diaphram is connected to C3? or where is the diaphram connected? Look at the photos. At the junction of R1 and the floating cap
The swA and swB are the same as the switch next to it. Look at schematic pdf. Think of headers as the double pole switch. So 2 headers. The low cut is the headers labeled LC.bxershrts said:Ahh - you are a good man Duantro!
Yes it is making more sense between the schematic and build photos.
So just so I have this straight in my head - the circuit is already setup for pad and lowcut - then simply adding a header to the pins at s1b and s1a at the top 2 pins engages the pad and LC in circuit?
With the header on the inside 2 pins its out of circuit and at the top 2 pins its in circuit?
so then what is s1a ? Pad
and then s1b is LC?
Then I ask what is the "pad on" for? ...or I guess its a switch or 2 switches at "pad on"....... or i simply use the pins and headers?
I hope I have that correct
And lastly I am using the cinemag 13101 - can you instruct me on how to wire in this xfrmer
RT - ROT = Red(1)
BR - Braun = Brown(2)
VI - Violett - Purple = Orange (3)
BL - Blau Blue = Yellow (4)
Black is Ground...
Thanks for your wisdom help and guidance.