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Dual Relay Driver Board Circuit (BC547)

2017-08-04 23:43  
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This article describes the Dual Relay Driver Board Circuit (BC547). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: BC547.

A simple and convenient way to interface 2 relays for switching application in your project. This relay driver boosts the input impedance with a regular BC547NPNtransistor (or equivalent). Very common driver. It can drive a variety of relays, including a reed-relay. Transistor Q1and Q2 are a simple common-emitter amplifier that increases the effective sensitivity of the 12 volt relay coil about a 100 times, or in other words, the current gain for this circuit is 100. Using this setup reduces the relay sensitivity to a few volts. R3 and R4 restricts the input current to Q1 and Q2 to a safe limit. Diodes D3 and D4 areEMFdampers and filter off any sparking when the relay

Figure:1 Front View Of Dual Channel Relay Board Driver

Figure 1 Front View Of Dual Channel Relay Board Driver

Figure:1 2 Channel Relay Driver Circuit Diagram

Figure 2 2 Channel Relay Driver Circuit Diagram


R1-R2 = 1K
R3-R4 = 5.6K
C1-C2 = 100nF-63V
D1-D2 = RedLED
D3-D4 = 1N4001
L1-L2 = 12V Relay
Q1-Q2 = BC547


Input – 12VDC84 mA Output - two SPDT relay Relay specification - 5 A230VAC
Trigger level-2~5VDC
Berg pins for connecting power and trigger voltage
LEDon each channel indicates relay status



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