Circuit Schematic learn

Switching power supply whose output voltage is appreciably lower than its input voltage has an interesting property: the current drawn by it is smaller than its output current. However, the input power (UI) is, of course, greater than the output power. There is another aspect that needs to be watched: when the input voltage at switch-on is too low, the regulator will tend to draw the full current.

When the supply cannot cope with this, it fails or the fuse blows. It is, therefore, advisable to disable the regulator at switch-on (via the on/off input). until the relevant capacitor has been charged. When the regulator then starts to draw current, the charging current has already dropped to a level which does not overload the voltage source.

Circuit diagram:




The circuit in the diagram provides an output voltage of 5 V and is supplied by a 24 V source. The regulator need not be disabled until the capacitor is fully charged: when the potential across the capacitor has reached a level of half or more of the input voltage, all is well. This is why the zener diode in the diagram is rated at 15 V. Many regulators produced by National Semiconductor have an integral on/off switch, and this is used in the present circuit.

The input is intended for TTL signals, and usually consists of a transistor whose base is accessible externally. This means that a higher switching voltage may be applied via a series resistor: the value of this in the present circuit is 22 kΩ. When the voltage across the capacitor reaches a level of about 17 V, transistor T1 comes on, whereupon the regulator is enabled.

The GPS mobile phone jammer owns the slow start circuit design.
As the profit margins of the conflict, the downstream distributors that upstream channel or production companies to earn more profits. There are channels of bargaining ability, regardless of the level of the channel members, as long as it is gradually expanding their own market power, more resources and profits from the upstream and downstream enterprises, resulting in a conflict. Compensate for price cuts, promotional costs and defective products and services is often a lot of conflict. Competitor analysis 1.3.1 Motorolas channel strategy for Motorolas channel has mainly taken the form of agency. Its development can be divided into several stages: before 1995, subject to the constraints of the market environment, Motorola sold by China Telecom. The power supply switch of GPS mobile phone jammer will generate the powerful current.
In 2002, Nokia strengthened at the retail level to compete with Motorolas comprehensive attempt selected five major chain stores in Shanghai and Guangdong, as a direct supply store. Across the agents directly to their supplier. In addition, in many provinces, Nokia in the seven major real estate agents outside a few strong regional distributors as a proxy to participate in the distribution of several models to compensate for the lack of agents across the country (Figure ). At the same time in the national underwriting way in some provinces and gradually try to regional underwriting. Nokia to enter the Chinese market than Motorolas much shorter time, so not much of a burden, distributors conditional direct construction of sales network. The effective shielding range of GPS mobile phone jammer is 5-10m.
Postel mainly rely on an agent on the market, such as long-term, Capitel Nokia store in major cities to establish system. Another feature of the Nokia channel construction is authorized service center functions with the store to play the store after-sales service advantages. From the characteristics of channel management, Nokias overall policy of the channel members are: multi-channel, few links, network refinement, price transparency. Nokia has recognized the phone as early as the end of 1997, will soon become a mature and transparent products, does not hold too many levels in the supply chain, develop and implementation of the Retail Management Plan is now store / concession counters plan. The rechargeable power supply of GPS mobile phone jammer is AC110-250V.The actual shielding range of mobile phone jammer is in the place