Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Hi, i'm aware of that but i wanted to do this as an "exercise" :)
- - - Updated - - -
would a resistor before baker clamp diodes of the Q4 fix the problem?
I came up with this circuit to control a 12V 6A fan's speed by a 5V PWM from another circuit, not sure if it's gonna work (i'm not very experienced nor knowledgeable in electronics), and i have a few questions:
1- to compensate for Q1's Vce, and turn off Q4 completely and reliably, when Q1 in...
8-no , i mean wasted power in output cap dis charger resistor
7-becuase r5 is 10k and if we except q6 Veb and q5 Vce we have about 3.5 ma in q5 collector , it isn't right?
11- can i use 0.250W resistors for r1 to r4?
12-what is best way to turn on an led when output current limited?
13-what is...
7-max current passing through q5 is about 3.5ma and its hfe in this Ic is about 130 so q5 need about 30 uA to bias but you used partly low resistor for it
i think you trying to keep opamp output voltage low, right?
8-because i think it's wasting power when output voltage is fixed
thanks
9-how many 2n3055 i should use if i want to edit circuit to 50v 10amp
10-switching is good for variable power supply? what's your view? (it's my next goal)
thanks
1-yes , but Vebo of bd135 is 5v and if we use -5v for opamp supply we have above -5v in output of opamp , voltages below Vebo can breakdown transistor?
2-and why we need -15 v for opamp supply? -2 or -5 v is not enough for opamp output be able to swing to zero?or that is for other reasons?
3-can...
1-can you introduce me a TO package transistor instead 2n3055?
2-and a simple circuit to create negative supply for op amp?(i think -2v is enough right?)
3-and if use any voltage below 5v can i remove d1 and d2?
4-what is input offset voltage of an opamp and how to null offset?
thanks a lot and...
i need min 30v in the output
and i have another question
in var psu when vout set into vx output capacitors charged at vx if we reduce output voltage and output capacitors enough large they can damage transistor?
what we can do?
thanks
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
