Circuit Diagram

74 Series digital circuit of 74284 4 × 4-bit parallel binary multiplier(high topological product)

Published:2011/8/1 20:21:00 Author:Lucas | Keyword: 74 Series , digital circuit , 4 × 4-bit parallel , binary multiplier, high topological product

OC output can generate topological product; it typically realizes two binary numbers topological product multiplication in 40ns; it can be extended to N-bit × n-bit application, 16-bit product - typical 70ns, 32-bit product - typically 103ns.   (View)

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74 Series digital circuit of 74278 4-bit cascade priority register(controllable output)

Published:2011/8/1 20:46:00 Author:Lucas | Keyword: 74 Series , digital circuit , 4-bit cascade, priority register, controllable output

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74 Series digital circuit of 74S274 4 × 4-bit binary multiplication (tristate)

Published:2011/8/1 23:55:00 Author:Lucas | Keyword: 74 Series , digital circuit , 4 × 4-bit , binary multiplication , tristate

Three-state output; it has given 8-bit product in 45ns (typical); it can be given n-bit × n-bit binary numbers factor product; when any one (or two) G input is high, all eight outputs are deadline.   (View)

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74 Series digital circuit of 74259,74LS259 8-bit addressable latch

Published:2011/8/2 0:51:00 Author:Lucas | Keyword: 74 Series , digital circuit, 8-bit addressable latch

D=the level of the data input end. Qio = the output level before establishing the steady-state input conditions. 8-bit parallel output storage register can make serial parallel conversion; asynchronous parallel clear; active high decoder; it can be extended to n-bit applications; it has four different function modes.   (View)

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74 Series digital circuit of 74248,74249 BCD seven segment decoder / driver

Published:2011/8/2 4:17:00 Author:Lucas | Keyword: 74 Series , digital circuit , BCD seven segment , decoder , driver

It can drive the effective high level output of light buffer; it has lamp test device; frontier, back porch are zero out; it can adjust the light intensity; 248 contains the boost resistor; 249 is the collector open circuit output, and the pin diagram is the same with 74246. 1. It requires 0 to 15, then the turning off input (BI) must remain high level, if it does not eliminate decimal zero, the dynamic turning off input (RBI) is open or high. If the low input is direct added to turning off input, all segment outputs are off regardless of the level of other inputs.   (View)

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74 Series digital circuit of 74246,74247 BCD seven segment decoder / driver

Published:2011/8/2 4:13:00 Author:Lucas | Keyword: 74 Series , digital circuit , BCD seven segment , decoder , driver

The open-collector output can directly drive the display; it has lamp test device; frontier, back porch are zero out; it can adjust the light intensity; the withstand voltage of 246 is 30V, and the withstand voltage of 247 is 15V; the 74246 and 7446,74247,7447 are similar but the word shapes, thus they are interchangeable. 1. It requires 0 to 15, then the turning off input (BI) must remain high level, if it does not eliminate decimal zero, the dynamic turning off input (RBI) is open or high. If the low input is direct added to turning off input, all segment outputs are off regardless of the level of other inputs.   (View)

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The typical application circuit of HFC68 audio lantern control IC

Published:2011/8/8 20:15:00 Author:Ecco | Keyword: typical application circuit, audio lantern , control IC

HFC68 is a special sound and light synchronization Lantern control IC, which is mainly used for sound rotating, chase, dance lights, karaoke 0K changing lights, and sound and lightcontrol Christmas tree lights.   (View)

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Digital lock 7

Published:2011/8/8 3:13:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the password control circuit and sound and alarm circuir, and it is shown in Figure 3-104. Password control circuit consists of password buttons SO-S2, thyristors VTl-VT3, resistors Rl-R3, light-emitting diode VL and solenoid YA. Sound and alarm circuit consists of the error buttons S3-S9, thyristor VW, resistors R4-R8, voice integrated circuit ICl, audio power amplifier integrated circuit IC2, voltage regulator diode VS, capacitors Cl-C5 and the speaker BL. Rl-R4 and R6-R8 use the 1/4W carbon film resistors or metal film resistors; R5 select the 1/2W metal film resistor.   (View)

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Digital lock 6

Published:2011/8/8 2:26:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the power switch SO, power transformer T, bridge rectifier UR, relays Kl, K2, password buttons Sl-Sl2, transistors VT, LED VLl, VL2, diodes VD1-VD4, resistors R1 -R3 and capacitors Cl-C6, and it is shown in Figure 3-103. Rl-R3 use the 1/4W carbon film resistors or metal film resistors. Cl-C4 select ultra small aluminum electrolytic capacitors with the voltage in 16V; C5 uses the monolithic capacitor. VD1-VD4 are choose 1N4148 silicon switch diode; VD5 uses the lN4007 silicon rectifier diode.   (View)

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Digital lock 5

Published:2011/8/8 2:21:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the input control circuit, reset circuit, counter / divider circuit and control implementation circuit, and it is shown in Figure 3-102. The input control circuit is composed of password buttons S1, S2, S5, S8, S9 and diodes VD3-VDl4, resistor R1 and so on. Count / divider circuit consists of IC and transistor Vl, resistors R2, R3, diode VDl. Reset circuit consists of capacitors Cl, C2, diodes VD2, VDl5, resistors R4, R5 and buttons S3, S4, S6, S7. Control implementation circuit is composed of transistors V2, V3, light-emitting diode VL, resistors R6, R7, relay (or electric lock) K and diode VDl6.   (View)

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Digital lock 4

Published:2011/8/8 2:16:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the timing trigger circuit, trick lock circuit, sound and alarm circuit and control implementation circuit, and it is shown in Figure 3-101. Timing trigger circuit is composed of the transistors Vl, V2, resistors Rl-R4, light-emitting diode VL and capacitor C. The trick lock circuit is composed of the password buttons S0-S9 and electronic lock integrated circuit IC. Sound and alarm circuit is composed of resistor R6, thyristor VT and alarm HA. Control implementation circuit is composed of the resistor, transistor V3, relay K (or electric locks), and diode VD.   (View)

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Digital lock 3

Published:2011/8/8 3:39:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit consists of the optical switch circuit, trigger, sound and alarm circuit and solenoid drive circuit, and it is shown in Figure 3-100. Photoelectric switch circuit consists of the light-emitting diodes VLl-VL8, phototransistors Vl-V8 and resistors Rl-R16. Trigger circuit consists of the Dl-D4 which are inside of six NOT gate integrated circuit ICl (Dl-D6) and eight-input NAND gate IC lC2. Sound and alarm circuit is composed of the integrated circuit IC3, transistors V9, VlO, voltage regulator diode VS, speaker BL and resistors R17, Rl8.   (View)

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Digital lock 2

Published:2011/8/8 3:36:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit consists of buttons S1-S10 (S1-S4 are valid password buttons, S5-S10 are the lock buttons), four RS trigger integrated circuit IC (Al-A4) and resistor Rl. Control implementation circuit is composed of the resistor R2, transistor V, Relay K and diode VD. Rl and R2 use the 1/4W carbon film resistor or metal film resistor. VD selects the lN4001 or 1N4007 silicon rectifier diode. V uses C8550 or S8550, 3CG8550 silicon PNP transistor. IC choosed the CC4043 CD4043 four-RS flip-flop circuit. S0 uses the ordinary power switch.   (View)

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Cycle timing controller 2

Published:2011/8/8 3:43:00 Author:Ecco | Keyword: Cycle timing controller

The cycle timing control circuit is composed of the power supply circuit and timing control circuit, and it is shown in Figure 3-90. Power supply circuit is composed of the fuse FU, power transformer T, bridge rectifier UR, filter capacitor C3, three-terminal voltage regulator integrated circuit IC2, current limiting resistor Rl and the power indicator LED VLl. Timing control circuit is composed of the time-base integrated circuit ICl, relay K, potentiometers RPl, RP2, resistor R2, capacitors Cl, C2, working indicating LED VL2 and diode VD. Rl and R2 use the 1/4W carbon film resistors or metal film resistors. RPl and RP2 use the small solid potentiometers or variable resistors.   (View)

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Cycle timing controller 4

Published:2011/8/8 3:27:00 Author:Ecco | Keyword: Cycle timing controller

The cycle timing controller circuit is composed of the power supply circuit, timer and control implementation circuit, and it is shown in Figure 3-92. The power supply circuit is composed of the step-down capacitor C2, discharge resistor R3, bridge rectifier UR, voltage regulator diode VS, current limiting resistors R4, R5, filter capacitor C3 and power indicator light-emitting diode VL. The timer circuit consists of the counter / divider integrated circuit IC and resistors Rl, R2, R6, capacitor Cl and diodes VD2-VD4. Rl, R2, Cl and lC form the clock oscillator circuit with the oscillation signal period (T) determining by the value of R2 and Cl.   (View)

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Cycle timing controller 3

Published:2011/8/8 3:47:00 Author:Ecco | Keyword: Cycle timing controller

The cycle timing control circuit is composed of the power supply circuit, ultralow frequency oscillator, display driver circuit, counting flip-flop and control implementation circuit, and it is shown in Figure 3-91. The power supply circuit consists of the step-down capacitor C6, discharge resistor Rl5, rectifier diode VDl, voltage regulator diode VS and filter capacitor C5. Ultralow frequency oscillator consists of the dual D flip-flop IC IC2 ​​(a D flip-flop which is inside of IC2) and electronic switch circuit ICl, potentiometers RPl, RP2, resistors Rl, R2, capacitors Cl, C2, diodes VD3, VD4.   (View)

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Digital lock 1

Published:2011/8/8 3:33:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the password input control circuit, error closed circuit, reset circuit and control implementation circuit, and it is shown in Figure 3-98. Password input control circuit consists of the buttons Sl-S4, transistors V3-V5, voltage regulator diodes VSl-VS3, resistors R3-R7 and capacitors C2-C4. Error closed circuit is composed of the buttons S6-S10, capacitor Cl, voltage regulator diode VS5, transistors Vl, V2 and resistor Rl. Control implementation circuit is composed of the transistors V6-V8, relay K, diode VD, voltage regulator diode VS4, resistors R9-Rl2 and capacitors C5, C6.   (View)

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Digital lock 8

Published:2011/8/8 3:18:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the password input control circuit and control implementation circuit, and it is shown in Figure 3-105. Password input control circuit is composed of the password buttons S1-S10 (S1-S4 are valid passwords, S5-S10 are invalid passwords), R-S flip-flop IC lC, resistors R1-R5 and capacitors Cl-C5. Control implementation circuit consists of the diodes VDl-VD4, resistor R6, transistors Vl, V2, and solenoid YA. C6 and C7 use the power filter capacitors. Rl-R6 select the 1/4W carbon film resistors or metal film resistors.   (View)

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Digital lock 9

Published:2011/8/8 3:21:00 Author:Ecco | Keyword: Digital lock

The digital lock circuit is composed of the light control coding circuit, logic control circuit, control implementation circuit and alarm, and it is shown in Figure 3-106. Light control coding circuit consists of the infrared light emitting diodes VLl-VM, infrared receiver photodiodes VDl-VD4 and resistors Rl-R8. Logic control circuit consists of NAND gate integrated circuit ICl (Dl. D4) and the OR gate integrated circuit IC2 (D5-D7). Control implementation circuit is composed of the transistor V, resistor R9, diode VD5 and relay K. Voice alarm circuit is composed of the integrated circuit IC3, audio power amplifier integrated circuit IC4, voltage regulator diode VS, resistors RlO-R14, capacitors Cl-C6 and the speaker BL.   (View)

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Inductive electronic doorbell 1

Published:2011/8/7 22:52:00 Author:Ecco | Keyword: inductive electronic doorbell

The inductive electronic doorbell circuit is composed of the inductive electronic switch and music generator circuit, and it is shown in Figure 3-115. Inductive electronic switch circuit is composed of the inductive electrode A, transistor Vl-V4 and the resistor R1, potentiometer RP components. Music generator circuit by the music integrated circuit IC, resistor R2, transistor V5 and speaker BL. Rl and R2 select the 1/4W carbon film resistors or metal film resistors. RP chooses the membrane variable resistor. Vl-V3 use 3DG6 or Sg013 silicon NPN transistors; V4 and V5 use C8050 or S8050, 3DG8050, 3DGl2 silicon NPN transistors. IC uses the KD9300 or CW9300 music circuit.   (View)

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