Si le pedis bien al Buscador :
https://www.forosdeelectronica.com/f31/bajar-tension-50-50v-amplificador-pre-20151/
https://www.forosdeelectronica.com/f21/regulador-tension-entrada-50v-49929/
https://www.forosdeelectronica.com/f27/bajar-voltage-48v-12v-17483/
https://www.forosdeelectronica.com/f21/bajar-tension-fuente-17207/
https://www.forosdeelectronica.com/f31/bajar-tension-50-50v-amplificador-pre-20151/
https://www.forosdeelectronica.com/f21/regulador-tension-entrada-50v-49929/
https://www.forosdeelectronica.com/f27/bajar-voltage-48v-12v-17483/
https://www.forosdeelectronica.com/f21/bajar-tension-fuente-17207/