Today we have new circuit for light adjustable circuit with IC 4017 which will be benefic to you. Please see Schematic on left your hand.

light adjustable circuit with IC 4017

IC556 and IC 4017 in Traffik Control of light – in the catalog of amateur radio resources to … The circuit uses IC 4017 and the [...]

The work of the power supply is the gain of 2N3053 2N3906 and 2N3904 is fixed internally at 2Watts.

2W switch power supply circuit

It is to compensate the reduction of output power due to low voltage supply the transistor uses the Bridge-Tied-Load principle (BTL) which can provide an output of around 1.5 to 2 W at [...]

dual regulator power supply circuit

Voltage Regulators low power consumption IC 78W series used in our instrumentation is now so cheap they are an economical alternative to simple regulators NPN-stabilizers. In addition, they offer the benefits of better regulation, current limiting / short circuit protection to 1000 mA shunt and heat down if the electricity disperses [...]