Economical relay circuit 2
Source: InternetPublisher:石榴姐 Keywords: Relay circuit BSP relay MDASH Updated: 2021/02/02
If the relay is to be controlled by a certain signal or a small DC voltage,
the circuit in Figure 6 3 can be used. This circuit is different from Figure 6 2 in that a triode VT2 is added. VTz acts as an electronic lock.
Both relays work in the economical state, and their power loss
can be reduced by 2/3 to 4/5.
The resistance of the current limiting resistor R3 can be calculated by the following formula:
R3={U.-[Uf+(2~3)])/If (kfl)
where U is in the formula. ——Power supply voltage, v;
Ui-relay release voltage, v;
If- relay release current, mA.
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