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I have mounted this circuit on a breadboard with 20K for P1, 100K for P2 and 10nF for C1. Deos not work. Do not lose your time and change schematics.
can you tell me a circuit for which we can keep the pulse width constant and vary the rate of that pulse.
what is the maximum range of frequency can we generate using this circuit?
Is it possible to generate 4.3MHZ?
The most I’ve ever been able to get out of a 555 is about 2.7mHZ.
hello guys i m designing a pulse generator using fpga and i have designed one.anyone know how to aadjust the on time by default we get 50% i want to reduce it to 25%.please reply with you idea thank you and i am using digital circuits mostly.
hello there, I have tested this circuit and it is working , however I would like to know how to calculate its pulse width? when I use to calculate it with astable formula I am not getting the same answer with the simulation.
thanks for this good way to use 555
I would like to ask small question .
If I use
1n4001
Instead of
1n4148
can the circuit work in the same operation ?
I made this one and it works fine, I checked it on my scope:
http://www.rmcybernetics.com/projects/DIY_Devices/homemade_signal_generator2.htm
Here is parts list: http://www.digikey.com/short/w7nnn
OR… these work okay: http://www.ebay.com/itm/181096913621
Thank you Steve, yr info helped me a lot.
José
Can some guru of the Forum help me please?
The circuit looks ok, but I need something slightly different, and I am electronic lover, not professional.
Help may be just tell me where they sell a proper kit for what I need, or, tell me tech proper name of what I am looking for.
This is the desired PMW circuit:
+B Voltage: 12-14 VDC
Input signal 1: an almost square signal which varies from 500Hz to 5000Hz app.
Input control voltage: 1 to 6 VDC coming from a control pot.
Needed output: square signal with the same frequency as input (variable) width proportional to control voltage (variable duty cycle, following same input frequency).
Thank you very much in advance.
Oldbeaver.
Dear Electro schematic,
Hi….I have construct and build the circuit. But not working, i dont know why? I have troubleshoot the connection, i check every level voltage, the problem voltage drop at R2 is zero and at R1 is 7.5 V. The power supply is +9 V DC, rite? I dont have +9V DC, i supply 7.5 V…is it working? can I supply 12 V DC? Please help me, Thanks.
Which frequency range can it provide ? I mena from 1 Hz to ..? Without calculation just changing the values of the POT ?