Making a PCB

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Making a PCB
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Our Task
Structure 1.1. Making a PCB 1.2. Assembling a
circuit 1.2.1. The components I choose 1.2.2. The
functions from the components 1.2.3. The way how
the circuit works 1.3. Comparison Traditional
placement - SMT
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Making a PCB
1.First the board is covered with
cooper and photosensitive film.
2.Then the circuit mask is applied
in the board.
3.Now, the board is exposed to light.
4.After that you etch away the unprotected cooper
in acid lotion.
5.If you etch the unprotected cooper away you
have to clean the surface of the board.
6.When the surface is drieded you have to drill
holes for the components.
7.Finally, components are soldered on your board!
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Assembling a circuit
Current circuit 1
Current circuit 2
Thats a current circuit to switch on lights on
differend places.
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The components I choose
For my current circuit I chosse this components
. relay (K1,K2)
. switch (S1,S2)
. lamp (H1,H2)
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The functions from the components
A relay is used to turn electric current on and
off when a current flows through the coil of the
relay.
A switch is used to turn electric on and off.
A lamp gives off light when a current flows
through it.
The switches, the lamps and the relays are
connected in series .
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The way how the circuit works
When the switch is turned on the current flows
through the coil of the relay. So the coil is
tighten and the current flows.
When current flows through the coil of the relay
current flows over the switches in the relay. So
the light will burn.
If you switched on the switch 1 (S1) the lamp 1
(H1) will burn. And when you switched on the
switch 2 the lamp (H2) will burn.
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Comparison Traditional placement SMT
Surface Mount Technology is better than the
Traditional placement then it is faster and it
has a greater reliability. For the SMT you need
smaller boards, because the circuits can be
smaller as by the traditional placement. When you
work with SMT-Method you must apply glue, then
place your components ? cure the glue and wave
solder the Board. A disadvantage from the
SMT-Method is you cant use this at home.