per prima cosa ti devo ringraziare per la risposta, pero' mi sorge un dubbio per quanto riguarda la resistenza/trimmer.Nella spegazione (in inglese
) che ho trovato mi č sembrato di capire che non dovrei metterci il "trimmer" ma solo una resistenza!
Ma cosi' facendo poi...........da dove vario il voltaggio?
Sii gentile se ti allego la spiegazione,potersti darmi risposte piu' sicure? Poi come faccio a sapere alla prima accensione se il trimmer e nella resistenza massima?
Allegato:The Board uses the LM431 from National together with a MOSFET to generate and regulate the memory voltage. This was also a familiar chip to me.
The LM431 could be compared to something like a adjustable Zener-Diode. You simply take one pin of the part, decrease itīs resistance against GND, and that increases the voltage.
Pin 8 is connected to 2 SMD Resistors. I soldered one wire between those 2 SMD Resistors and one wire to GND. I connected a 2,2 kOhm between these 2 wires and were able to adjust the memory Voltage (didnīt try further than 3 Volt).
To know what the memory voltage is, measure the voltage between the marked point (īmeasure hereī) and GND.