Iata un circuit simplu, as zice ca e cel mai simplu posibil pentru scopul propus: un invertor de putere mica / consum mic pentru contoare Geiger, care poate fi alimentat de la 2 baterii AA in serie.
Are la baza un oscilator cu feedback, un transformator pe un miez de ferita bobinat manual (650spire in secundar, sarma foarte subtire!), si o serie de diode zener si un transistor care blocheaza oscilatia pentru partea de regularizare.
(http://www.pocketmagic.net/wp-content/uploads/2014/07/inverter_400V_sch-300x98.png) (http://www.pocketmagic.net/2014/07/3v-to-400v-regulated-inverter-for-geiger-counters/) (http://www.pocketmagic.net/wp-content/uploads/2014/07/inverter_400V_pcb-300x177.png) (http://www.pocketmagic.net/2014/07/3v-to-400v-regulated-inverter-for-geiger-counters/)
Are consum mic, eficienta mare si un output stabil:
(http://www.pocketmagic.net/wp-content/uploads/2014/07/inverter_geiger_3V_400V-1-300x199.jpg) (http://www.pocketmagic.net/2014/07/3v-to-400v-regulated-inverter-for-geiger-counters/) (http://www.pocketmagic.net/wp-content/uploads/2014/07/inverter_geiger_3V_400V-2-300x199.jpg) (http://www.pocketmagic.net/2014/07/3v-to-400v-regulated-inverter-for-geiger-counters/)
Detaliile complete le-am postat pe blog: http://www.pocketmagic.net/2014/07/3v-to-400v-regulated-inverter-for-geiger-counters/ (http://www.pocketmagic.net/2014/07/3v-to-400v-regulated-inverter-for-geiger-counters/) . Am insistat si pe partea realizarii bobinelor transformatorului, pentru ca multa lume pare sa se impiedice de asta.
Circuitul in format Eagle si PCB-ul ca si PDF sunt disponibile aici: http://www.pocketmagic.net/wp-content/uploads/2014/07/geiger_high_voltage_3V_400V_supply.zip (http://www.pocketmagic.net/wp-content/uploads/2014/07/geiger_high_voltage_3V_400V_supply.zip)
In montajul meu de test , am folosit diode zener: 3x120V + 2x16V si am masurat 384V la iesire. O valoare foarte buna pentru tuburile Geiger rusesti. Spor la mesterit!