Hula-Cow Studios - Cincinnati Ohio, Duffy P. Weber www.HulaHulaMooCow.com voice acting and voiceover studios Cincinnati, Ohio
   
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Welcome to Hula-Cow Studios! Click on a link above to learn more.


We are a digital recording and voiceover studio in Cincinnati, Ohio, specializing in video game, radio, cartoon, and character voice.
We also know a great SFX/music engineer. We now do audiobooks and audio book production!

Stripped U87 Ai
Bill of Materials (BoM)
Add-ons

 

PCB kit board for building

 

Stripped U87ai based on ORS circuit: 
PCB BOARD: $29 + Tax/Ship

 

 

 

THIS PAGE IS CURRENTLY UNDER CONSTRUCTION. Thank you for your patience.

 

Full kit and board for building

 

 

THIS PAGE IS CURRENTLY UNDER CONSTRUCTION. Thank you for your patience.

 

Other Versions/Boards

 

 

THIS PAGE IS CURRENTLY UNDER CONSTRUCTION. Thank you for your patience.

 

 

- Mouser

Click here for the Mouser BoM Link:

-Mouser BoM for Stripped 87ai-

THIS PAGE IS CURRENTLY UNDER CONSTRUCTION. Thank you for your patience.

BoM List for Stripped 87Ai:

PCB:

Hula-Cow Studios Stripped 87Ai printed circuit board (left)
Hula-Cow Studios Att Pad daughterboard (right, optional)


MATERIALS/BoM:

Resistors:

1G || 1M || 330k || 300k || 56k || 47k || 10k || 2k2 (x2) || 7k3

Trimmer Resistor:

25K

Capacitors:

33nF (NP) || 120-180(220*)pF (NP)
(*NOTE the 220pf seems to work well. Higher values temper the highs.)

470 nF (NP) || 10uf 63v (x2) || 4u7 35v || 20uF 6v || 10nF ||
1uF 160v

Transformer:

Cinemag CM2480 or sim. (10.5:1)
OR:
Neutrik NTE10/3 (NOTE! This is the one on the Mouser BoM. This transformer gets wired in reverse, swapping primary and secondary, for correct turn ratio.)

FET:

2n3819 or sim.

Zener:

1N4749a


===================

H-PAD DAUGHTERBOARD:

Resistors:

500r (x4) || 967r (or close. -5dB) || 470r (-10dB) || 220r (-15dB)

Switch:

1p4t (for 4-position -0,-5,-10, -15) OR:
1p3t (for 3-position -0,-5/-10/-15) OR:
1p2t (for 2-pos on/off)


 

- Attenuating 2-4 position H-pads/other add-ons


Stripped U87ai plus add-on expansion daughterboard for Base board plus a backboard to add up to 3-way attenuation pad switch, and brightness switch.

PCB BOARDS: $39 + Tax/Ship



H-pad/highEQ(brightness) expansion daughterboard only

Should work with any U87 clone board, nut just Hula-Cow Studios'.

PCB BOARDS: $15 + Tax/Ship

Available to add back some of the functionality removed from the ORS version of the 87ai circuit. This installs a fairly transparent single- or multi-positional H-pad between the mic circuit and the interface. You can use it with an on-off, and on-off-on, an on-on-on or an on-on-on-(on/off) switch.

It's based on the circuit from the Hydra - a splitting attenuator with pass-thorugh we and our customers have enjoyed using over the years. It's a reliable, tested circuit that we're happy to include into this build.


There's also a fun little feature in the form of a brightness switch function to swap between two capacitors near the backplate, to add a treble pad/boost.


THIS PAGE IS CURRENTLY UNDER CONSTRUCTION. Thank you for your patience.

COMING SOON

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