Power Supply
A stable and well-filtered toroidal-core power supply provides the basis for good sound processing.
The GND LIFT switch helps to remedy hum loops.
Ample filtering,smoothings and calibrations make for stable,constant service voltage.
The phantom supply voltage is from a separate power supply with sophisticated filtering and selected components.
Special attention has been paid to the power supply of the MikeMan. The power pack is the heart of any unit, and the more accurately it works, the more this improves results.
The power supply is installed around a toroidal-core trans- former which does not cause any electronic humming or mecha- nical sounds as a result of its minimum leakage field. The primary voltage can be switched between 230 V / 50 Hz and 115 V / 60 Hz.
A3-pole standard IEC mains connection socket serves to connect a detachable 3-pole mains lead which is included in the scope of supply. Transformer, power cable and mains connector comply with the requirements of VDE, UL and CSA.The fuse rating is 200 mA.
The connection between ground and housing can be sepa- rated via the GND LIFT switching option. Hum loops can be reme- died in this way.
On the secondary side of the power supply, an RC combination is used to filter out noise and hum voltages from the mains side. Both half-waves are smoothed with 2000 mF capacitors in the positive and negative voltage path.
An independent, self-contained power pack is used for the phantom power supply. It obtains unregulated AC voltage from 2 x 25 V coils in the transformer. This results in +/- 22.5 V DC via bridge rectifiers which are filtered with 1000 mF. The DC voltage is adjusted to exactly 48 V in the switching power supply (LM 311) downstream. It is then smoothed again and stabilized. The power supply current flows to the intrusion point via the PCB. An RC combination stabilizes the power supply again at this point. Two medicinal 6.81 kW resistors with a tolerance of only 0.1% are used as bridging resistors.
