BJT 1/3-Supply Generator & Controlled Current

This circuit generates an output voltage equal to ⅓ of the supply voltage using BJT biased by a string of diodes and resistive voltage divider. The resistive divider sets the power supply to output voltage ratio. The BJT serves as a buffer and the diodes compensate for the emitter-to-base voltage (Veb) drop. The output voltage is taken at the emitter of the BJT and the emitter current is set by Re. The output current can be obtained at the collector of the BJT. The output voltage and current will not automatically scale with power supply voltage and will be affected by load (emitter resistance) variation.