Simple Fixed DC Regulator using many zener diode. Good idea if use zeners!
Simple Step up DC converter circuit using Transistor 6V to 12V!
This again idea example ac to dc converter model to be simple. By modify 9VAC to 35VDC from when how many is see the circuit has already.
It is a ideal for small size circuit and easy. It is a switching voltage regulator circuit. 5V USB to 12V output low current such as LED display. LEarn It moRe!
This is 5V 3A Switching Regulator circuit by LM2576-5.0 is simple switching power supply 3A step down regulator for power digital circuits. [...]
The boost step-up regulator based an LM2577-ADJ switch voltage regulator chip.
voltage to frequency converter circuit
See idea: Voltage to frequency converter circuit use CA3130 OP-Amp, that linearity Of changing up to 0.5% and Temperature coefficient.