Circuit Diagram

crystal diode DDZX22DTS、DDZX24CTS、DDZX43TS internal circuit diagram

Published:2011/4/26 10:32:00 Author:Nancy | Keyword: crystal diode

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crystal diode DDZX16CTS、DDZX18CTS、DDZX20DTS internal circuit diagram

Published:2011/4/26 10:34:00 Author:Nancy | Keyword: crystal diode

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BZMTA-700/800 amplifier control and display circuit diagram (-)

Published:2011/4/26 10:38:00 Author:Nancy | Keyword: amplifier, control and display

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crystal diode DDZX13BTS、DDZX14TS、DDZX15TS internal circuit diagram

Published:2011/4/26 10:41:00 Author:Nancy | Keyword: crystal diode

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Gaoshi AV9095 amplifier key and display circuit diagram

Published:2011/4/26 10:47:00 Author:Nancy | Keyword: Gaoshi, amplifier, key and display

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Gaoshi AV9095 amplifier key and display circuit diagram （-）

Published:2011/4/26 10:46:00 Author:Nancy | Keyword: Gaoshi, amplifier, key and display

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555 square wave generator circuit diagram

Published:2011/4/26 10:48:00 Author:Nancy | Keyword: square wave, generator

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Gaoshi AV9092B amplifier display and control circuit diagram

Published:2011/4/26 10:50:00 Author:Nancy | Keyword: Gaoshi, amplifier, display and control

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A professional 51 MCU test panel

Published:2011/4/26 3:51:00 Author:Ecco | Keyword: professional , MCU , test panel

Onboard buzzer and reset button can be used to do some sound tests. Board four button inputs can be selectable interrupt / query. All four ports are connected to P can be pre-10K pull-up resistor row. IIC bus is connected real-time clock device PCF8563. IIC bus is connected to EEPROM device 24C02, the features are similar to the Hengjian's products. 74LS244 onboard driver chips can be driven by non-simple P port directly, it has better protection to single chip. MAX232 chip board ahs standard RS-232-C serial interface and it can be used for online testing for PC.   (View)

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74 series digital circuit 74LS280 74S280 and other 9 bits odd even generator/validator

Published:2011/4/26 4:32:00 Author:May | Keyword: digital, 9 bits, odd even generator, validator

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Electronic fishing device

Published:2011/4/26 3:42:00 Author:May | Keyword: Electronic, fishing device

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1500W square-wave inverter

Published:2011/4/26 3:43:00 Author:May | Keyword: 1500W, square-wave inverter

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74 series digital circuit 74LS445 BCD decimal decoder/driver (OC)

Published:2011/4/26 3:57:00 Author:May | Keyword: digital, BCD, decimal decoder, driver, OC

74 series digital circuit 74LS445 BCD decimal decoder/driver (OC) 74LS145's low voltage type, withstand voltage is 7V; absorption current is 80mA.; typical power consumption is 35mW; Pin diagram and function table is same to 74LS145.   (View)

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74 series digital circuit 74LS448 four three bus receiver (OC)

Published:2011/4/26 3:59:00 Author:May | Keyword: digital, four three bus receiver, OC

Its pin diagram and function table is same as 74LS440.   (View)

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74 series digital circuit 74490 74LS490 etc dual four bit decade counter

Published:2011/4/26 4:07:00 Author:May | Keyword: digital, dual four bit, decade counter

74490, 74LS490, 74HC490 dual four bit decade counter It is the dual type of 7490A and 74LS90 normal counter. The highest counter frequency is 35MHz. It is buffer output.   (View)

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Push pull type switching regulated power supply circuit composed of CW1524

Published:2011/4/26 3:45:00 Author:May | Keyword: Push pull, switching regulated power supply

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SIPMOS transistor push pull control circuit

Published:2011/4/26 2:56:00 Author:May | Keyword: SIPMOS transistor, push pull control

Input end of this circuit is connected integrated circuit TDA4700. When its output transistor turns on, base of T1 has voltage which is determined by R1, R2. Diode D1 and D2 is used to prevent the over saturation of T1. If output transistor of TDA4700 is cut off, T1 is cut off, T2 is controlled by R4, at this time, SIPMOS transistor input capacitor (crossover in the justified of R5 and T2) is as limiting resistor. The current consume of this circuit is very small because it adopts push pull control mode.   (View)

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RS232C Pin with the diagonal connections

Published:2011/4/26 3:36:00 Author:Ecco | Keyword: Pin , diagonal , connections

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Simple nickel-cadmium battery charger

Published:2011/4/25 23:02:00 Author:May | Keyword: Simple, nickel-cadmium, battery charger

The circuit is shown in diagram 2-2. It consists of three terminal regulator 708 and four loads current source composed of triode VT2~VT5. VT1 and corresponding adjustable resistance RRP1, RP2 and switching tube S is used to control each roads charging current. When S is placed on position 1, charging current of each roads is 90mA; when S placed 2 and 3, it can get 100mA~300mA charging current by adjusting RP1 and RP2. If it adopts current above 200mA to charge, each triode should add radiator. Light emitting diode VD5~VD8 in diagram 2-2 is used as charge indicator. Whole circuit can supply by 220V mains, it also can supply by 12V storage battery. Charge time can count according to the following formula: Charging time(h)=Nickel-cadmium battery capacity(mAh)/charge current(mA) In actual use, charging time can proper extended.   (View)

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Compact keyboard trainer-the application example of PS / 2 keyboard interface circuit

Published:2011/4/26 3:33:00 Author:Ecco | Keyword: Compact, keyboard trainer, application example , PS / 2, keyboard interface

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