Well .. after trying to explain what the theory of operation of the musical instrument known the name of Theremin step is to be achieved ..
First I designed the circuit with the electronic cad, and I created the motherboard.
then I proceeded to create photo-engraving by the board on which to mount electronic components .. To do this I
printed circuit on a piece of transparent paper, which I placed on the face of a photosensitive base for electronics. Illuminating with an ultraviolet lamp to the plate, the photosensitive material has been removed from the surface where the ink was not present at the press.
After that I dipped the board in ferric chloride, which then corrode the copper in all the areas in which non c'era più pellicola fotosensibile.
L'aspetto finale della piastra è questo:
Ho poi forato tutte le piazzole per i componenti ed ho proceduto all'assemblaggio della scheda..
A montaggio ultimato il circuito si presenta così:
A questo punto ho montato il circuito nel mobile che ho scelto per il
prototipo ed ho provveduto alla taratura degli oscillatori per centrarne lefrequenze di lavoro una volta collocate le due antenne esterne: Terminata la taratura ho chiuso la scatola ed ho iniziato i test.
The circuit works .. I still have some problems with the management of the volume antenna, which is not very sensitive and I need to improve the frequency range of the pitch .. But all in all I can be satisfied ...
A further modification that I made the initial project plan was the inclusion of a switch to mute, so as to completely silence the Potamin without needing to turn it off .. A post soon
of samples made with the nice tool .. It is very difficult to play (at least for me .. ehehe)
Stay tuned
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