52613 sfw356645eh5ah6j75
Member
well, hi, i builded this alkaline battery charger with constant current and pulse charging but have a little problem getting the gate voltage down to zero. i used a pnp to discharge the gate when the 555 is of state. the thing is that it goes down to 0.6v which is the saturation voltage of the pnp.
Any way to get it down to 0 without using a relay? the problem is that as the gates remains at 0.6v, theres still some current flowing so i cant get belown 2mA
**broken link removed**
the lm317 is in fact a lm385 but i coulnd find the part in the simulator![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
actual circuit in the breadboard
**broken link removed**
ps: it works at 0.35Hz / 25%
Any way to get it down to 0 without using a relay? the problem is that as the gates remains at 0.6v, theres still some current flowing so i cant get belown 2mA
**broken link removed**
the lm317 is in fact a lm385 but i coulnd find the part in the simulator
actual circuit in the breadboard
**broken link removed**
ps: it works at 0.35Hz / 25%
Last edited: