MIC&MOD M25 Manual

Mic & Mod M25 microphone.
The Mic & Mod M25 microphone was designed as an affordable alternative to
the existing range. Initially intended for podcast makers and people who
want to record at home. Which does not mean that the quality would be
inferior to the microphones from the existing series! By choosing a high-
quality electret microphone capsule, this microphone can compete with
copies with a much higher price. Building is quite simple and does not require
extensive knowledge of electronics.
In addition, the microphone has two voicings that can be chosen by the
builder. All that is needed is a soldering iron, some experience in soldering a
printed circuit board and a universal meter for adjustment.
Here is a list of all the components you need to build a M25 microphone:
Capacitors:
1 1000 pF RM5
3 10 nF RM5
2 0.22 µF RM5
1 47 µF 35V electrolyt
1 220 µF 10 V electrolyt
Semiconductors:
1 FET 2SK30A
2 BC557B, selected
2 Zener diode 6,2 V.
1 Zener diode 9,1 V.
Resistors:
2 22 Ohm
1 1 K.ohm
2 2.2 K.ohm
1 6.8 K.ohm
Red or white rectangle, 1000pF or 1 nF
Red rectangle, 10nF or 0.01µF or .010
Red or yellow rectangle 220nF or .22µF
Black round, 47µF / 35V or higher
Black round, 220µF/10V.
Black, 3 wires
Black, 3 wires, paired
6.2 (labeled)
9.1
Red-Red-Black-Gold (Brown)
Brown-Black-Black-Brown (Brown)
Red-Red-Black-Brown (Brown)
Blue-Grey-Black-Brown (Brown)