Variable Current Relay - note that the relay coil is not only an electromag but it is also an inductor when power is applied to the coil due to the switching action of the transistor a maximum current will flow as a result of the dc resistance of the coil as defined by ohms law i v r p div div class b algoarticletextcarousel id ce carousel 507743586 2 div id slideexp1 1b4a1bc class b slideexp data wire i slideexp init b select i f selected o f active o data control id slideexp1 1b4a1b data appns serp data k 5354 1 data stk div class b overlay div id slideexp1 1b4a1bchevrons prevbtn class btn disabled prev rounded bld data dir div class bg span span div div class vcac div style height 32px margin top 16px div class cr div div div div div div div id slideexp1 1b4a1bchevrons nextbtn class btn disabled next rounded bld data dir div class bg span span div div class vcac div style height 32px margin top 16px div class.

cr div div div div div div div div class b viewport div class b slidebar id slideexp1 1b4a1b role list aria label please use arrow keys to navigate div class slide data dataurl data rinterval data appns serp data k 5337 1 tabindex 0 role listitem a href https electronics tutorials ws blog relay switch circuit html h id serp 5336 1 div class b insideslide div class b title npn darlington relay switch circuit div div class b text the previous npn transistor relay switch circuit is ideal for switching small loads such as led s and miniature relays but sometimes it is require div div a div div class slide data dataurl data rinterval data appns serp data k 5339 1 role listitem a href https electronics tutorials ws blog relay switch circuit html h id serp 5338 1 div class b insideslide div class b title emitter follower relay switch circuit div div class b text as well as the standard mon.

emitter configuration for a relay switch circuit the relay coil can also be connected to the emitter terminal of th div div a div div class slide data dataurl data rinterval data appns serp data k 5341 1 role listitem a href https electronics tutorials ws blog relay switch circuit html h id serp 5340 1 div class b insideslide div class b title emitter darlington relay switch circuit div div class b text this is the darlington transistor version of the previous emitter follower circuit a very small positive base current applied to tr1 causes a much div div a div div class slide data dataurl data rinterval data appns serp data k 5343 1 role listitem a href https electronics tutorials ws blog relay switch circuit html h id serp 5342 1 div class b insideslide div class b title pnp collector relay switch circuit div div class b text the operation of this circuit is the same as the previous.

relay switching circuit in this relay switch circuit the relay load has been connected div div a div div class slide data dataurl data rinterval data appns serp data k 5345 1 role listitem a href https electronics tutorials ws blog relay switch circuit html h id serp 5344 1 div class b insideslide div class b title n channel mosfet relay switch circuit div div class b text mosfet relay switching operation is very similar to bipolar junction transistor bjt switch operation seen above and any of the previous circuits div div a div div class slide data dataurl data rinterval data appns serp data k 5347 1 role listitem a href https electronics tutorials ws blog relay switch circuit html h id serp 5346 1 div class b insideslide div class b title p channel mosfet relay switch circuit div div class b text the p channel enhancement mosfet pmos is constructed the same as for the n channel.

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