Hmmmmmm... a Little more than 28 V ? Say 30 V ?He better have a 28V supply if he wants to amplify to that level
Thank you for your mentioned, but the problem is not there, I had attached a new circuit.Scottwang, please check the value of R4 & R5, it seems that PNP will never conduct with the values given in the schematic you posted.
Cheers
Alberto
Sure it will. With Q1 saturated there will be about 1mA going through R4 and about 0.7V / 2.7K = .26mA going through R5. That leaves .74mA coming from the base of Q2. That's way more than enough to saturate Q2 with its half mA collector current.................... please check the value of R4 & R5, it seems that PNP will never conduct with the values given in the schematic you posted.
A similar question came up recently - you can use a c_a_s_c_o_d_e (have to do it like that or the spellcheck sneakily changes it to cascade!).Hi ALL,
I am a new in electronic.
Do anyone know how to amplify a 5V square wave to 28V square wave???
Should I use an amplifier or transformer? Or other IC?? Please recommend.
Please kindly help!!
Many many thanks!!
Cole
5V frequency is 30Hz. Can we not change the frequency? I mean the input frequency = output frequency??It just needs a voltage level conversion.
What's the load of 28V square wave and the current of load?
What's the frequency of 5V square wave?
The below is a 5V to 28V voltage level conversion..
I got 28V DC supply on the other side. I dont want to change the input frequency 30Hz. Is it possible?It might help to have a description of what/how it will be used (28volt side), a schematic of what you are connecting to And a nice schematic for the 5 volt source.
Some info on frequency is also helpful and spec for your definition of just how square it must be.
Yes, it is possible - to a limit. Flip-flops can easily cut frequency by half. Frequency doubling circuits also exist. Using counters you can get many, many options - (you may have to run back through a flip-flop to re square you re-square your wave.I got 28V DC supply on the other side. I dont want to change the input frequency 30Hz. Is it possible?
Please go back to see the new posted circuit on #8, the output frequency will be the same with the input frequency.5V frequency is 30Hz. Can we not change the frequency? I mean the input frequency = output frequency??
Many thanks!
There are two ways to solve the problem as what you said about the Ib and Ic, the one is to take the 1k Rbe away, and reducing the values of Rb from 4.7k to 4.3k, that is to match the official info of datasheet, when Ib=1mA then the Ic will be equal to 10mA and the Vce will get into the saturation region.
With 5V input voltage and assuming that transistor Q1 2N3904 has Vbe = 0.6V, the current flowing through resistor 1K is 0.6mA and through 4.7K is 1mA. So the base current of Q1 is 1mA - 0.6mA = 0.4mA.
Could you tell me how can I find the beta of Q1 from its datasheet corresponding to that base current?
The datasheet shows DC current gain with different Ic but here I don't know Ic, how can I do that???