This kind of wireless presenter green laser pointer adopts the radiofrequency remote control design

Due to the design of the so-called "high power" In fact, only small and medium-sized power, so not quite care about the efficiency of the power supply. In order to achieve the requirements of accuracy, stability, so we designed the program to select the linear power supply. The adjustment device operates in a linear series of negative feedback inhibition of the ripple. In order to achieve the precision and stability requirements, two adjustment module, the former a regulator chip, the expansion flow, transported to an adjustment module, and then adjust to achieve the suppression of ripple and noise reduction requirements. The following is a basic block diagram of the basic block diagram of the design in Figure 3-1: Figure 3-1 voltage source. Electricity through the grid filter (to prevent a variety of high-pressure situation arising as a result of unusual circumstances, such as lightning) into the transformer. So that the customer can use green laser pointer with more ease and convenience.
Dropped 2lV (peak) by the regulator blocks the expansion flow circuit composed of an adjustment of the circuit after the rectifier filter; stage series - sampling - feedback - to adjust the final output. Power supply voltage source, this part of the circuit is a series of negative feedback adjustment circuit to achieve constant current. The only sampling the current sampling. The reason is to ensure accuracy. Taking into account the laser protection, the need to use the slow start circuit, the current output before you start, semiconductors, a smooth transition to the normal work area when not to. In addition, to avoid interference reasons, the circuit for the time being should not be designed for CNC or machine control, this will bring a lot of noise. So that the customer will not feel cold when they hold green laser pointer by hand.
Figure 3-2 below its basic design diagram: basic design diagram of the current source in Figure 3-2. The theoretical analysis and design of specific programs. Series of negative feedback principle. Throughout the system, the design of appropriate feedback section to have a very stable and fast tracking the effect of the output signal and the reference signal, is the main part of the design and key links. Basic Analysis: From the above analysis we can see: our system is actually two to achieve with a design method. The two systems can in fact be simplified as shown in Figure 4-1, a correction method, get the output signal to track the reference signal by a certain percentage, and stable and sensitive changes in the tracking process. It will make the customer hold green laser pointer more conveniently and comfortable.
So, our work is actually constructing an appropriate error caused by the transmission coefficient H (s) of the input signal and output signals meet the following requirements: First, we should create a stable system, to prevent the transfer function of any system of non-stable to improve the performance of the system-defined error signal, followed by talk about: Obviously, in order to eliminate the ripple and noise requirements, the requirements increase with time is reduced to 0, namely: the definition of the effectiveness of the system; the definition of tracking speed: set error signal is reduced to the initial error when used for the error decay time parameters are: the definition of the sensitivity of the system, then as our feedback system. green laser  has the anti-impact characteristic.