I found my 555 pwm circuit and a BCD counter and wanted to stick them together, in my diagram i used simple transistors to decode the resistors, note that i wired them in series to the Rpack would simulate a n^2 value for the bits,, but IDK how to wire them up properly, as far as i can get is that i need pnp transistors,, it worked good with relays but i'd prefer transistors, so its not so bulky, any ideas??
An R-2R ladder network is designed to generate a current output into a a virtual ground or very low impedance load to achieve good accuracy. Feeding its output into the discharge pin will reduce that accuracy since that's not a low impedance load.