====== Amplifier ======
original source(([[http://en.blitzortung.org/Compendium/Documentations/Documentation_2014-05-11_Red_PCB_10.4_PCB_12.3_PCB_13.1_PCB_14.1.pdf|Documentation System RED]], chapter 4.2))

Every amplifier has its own specific signal characteristic depending on the type of the low-pass, the
type of the high-pass filter, the type of the op-amps used and so on. The different types of the circuits
and components can cause different signal forms and different time delays. This is the main reason
why we strictly recommend that all users should exclusively use the same amplifier circuits, in particular,
one of our recommended amplifier circuits. Wrong time stamps can considerably confuse our
calculations. Finding the reason for false calculations can be very time consuming.
We offer several different amplifiers for different antenna types. Our standard amplifier for magnetic
field antennas (H-field antennas) is Amplifier PCB 12. These are for example loop antennas
or ferrite rod antennas. An amplifier for electric field antennas (E-field antennas) will probably be
introduced in the fall of 2013. We will modify the amplifier circuits from time to time to improve its
quality for our special application and to reduce the price.

{{:en:hardware:e_field_antenna_copper_ring.png?400x400|}} {{:en:hardware:e_field_antenna_copper_plate.png?200x400|}}\\
Figure 25: An e-field antenna build with copper plates

{{:en:hardware:e_field_antenna_wire1.png?250x400|}} {{:en:hardware:e_field_antenna_wire2.png?250x400|}}\\
Figure 26: An e-field antenna build with a 30cm wire

{{:en:hardware:signal_lightning_discharge.png?400|}}\\
Figure 27: A signal of a lightning discharge received by an electrical antenna (above) and by a ferrite rod antenna (below)\\