Since my first tests and tryouts where successfull (see my "My first spectrum" topic), i want to share my detector with you. Maybe someone is interested in seeing it ;)
I liked the circuit of the theremino, but I'm more a fan of a "one-case-item", so not a circuit where you have to add a soundcard. So i constructed my own version of it.
Basically i copied the HV-Signal-Detection from the theremino circuit. For the Supply i used a ISEG Power supply which was sitting in a shelf for a few years. It can go up to 4kV, but i limited the way to around 1500V, so i can not accidentially set the voltage to high.
For bringing the signal to the computer, i used a PCM2912 Integrated Circuit from Texas Instruments. This is basically a "USB-Soundcard" as a electric component. The Part does not need a special driver and installs automatically under windows. So i can directly interface my detector driver by USB, and do not have to use a Audio-Wire and Soundcard.
The detector driver runs by 12V Wall-Wart.
I made a relatively compact pcb that will fit into an aluminium case which i have ordered, but its not arrived yet :/.
Attached is a image of the finishied pcb and the schematic.
- L08B8144.jpg (904.2 KiB) Viewed 5244 times
- spectr..png (147.31 KiB) Viewed 5244 times
