13 Threads found on edaboard.com: 555 Timer Frequency Generator
To keep the cost down I would use a 555 timer as a PWM generator for each chain.
For only 20mA per LED chain, from a 24Vdc source, a BJT or a 2N7000 MOSFET would be suitable.
The frame frequency of the 555 PWM generator could be selected for each LED colour chain.
Lots of simple (...)
Microcontrollers :: 09-19-2015 07:48 :: esp1 :: Replies: 10 :: Views: 762
Have you considered using the 555 timer IC as a pulse generator?
It will provide up to 200 mA to your load. It is inexpensive and easy to use.
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Sample configuration of 555 as a pulse generator.
The resistors and capacitors at left determine the frequency.
By altering (...)
Professional Hardware and Electronics Design :: 10-15-2013 17:41 :: BradtheRad :: Replies: 3 :: Views: 982
The higher the frequency, the smaller the transformer. It's easy to find transformers for audio frequencies and they can be tiny. Any oscillator would work, even something based on a 555 timer.
Analog Circuit Design :: 05-11-2013 02:19 :: jcaram :: Replies: 5 :: Views: 787
i would like to make an frequency generator using a 555 timer chip. The frequency should vary in the range of 100hz to 1kHz with a reasonable duty cycle (20-80%). I am using the circuit below. Varying r2 alone would not do the job because at r2=0 the duty cycle is 100%.
I found out if i started (...)
Elementary Electronic Questions :: 08-08-2012 20:12 :: Faddei :: Replies: 13 :: Views: 8625
I want to make a variable (0.2 Hz - 1kHz) clock/pulse generator AND display the generated frequency value (e.g. 1024 Hz) on a 16x2 LCD display or to 7-segment display. I was going to use a 555 timer with a potentiometer to vary the output frequency of the 555, but a friend told me the (...)
Analog Circuit Design :: 01-21-2012 10:24 :: syntaxerror247 :: Replies: 4 :: Views: 2742
I need to generate a 10kHz triangular wave 0 to 5V level..
I ve the facility to generate a sqaure wave of desired frequency 0 to 5V level. I just need to convert it to trangular wave form.I ve 555 timer, some opamps if needed. Very tight linearity is not required.Its for testing purpposes..What can be a simple solution?
Analog Circuit Design :: 06-21-2011 12:51 :: themaccabee :: Replies: 10 :: Views: 6751
how can i use 555-timer as function generator..what suitable circuit for this title
Hobby Circuits and Small Projects Problems :: 12-15-2010 15:10 :: syiera :: Replies: 0 :: Views: 2491
You will not get a symmetric square wave with only the 555 (50% duty cycle) and a variable output frequency will change the duty cycle also. Try another IC like XR2206.
Hobby Circuits and Small Projects Problems :: 09-15-2008 21:17 :: rkodaira :: Replies: 3 :: Views: 11569
use 555 timer circuit
Analog Circuit Design :: 06-02-2008 11:50 :: darla1 :: Replies: 4 :: Views: 1686
That is wery simply to make seconds indication. You connect 2 7447 and 2 LED display to U11 and U12 like displays of minutes. timer 555 is not stable. You must use piezo cristall for frequency generator.
Elementary Electronic Questions :: 12-31-2006 22:06 :: Jan Iwaniuk :: Replies: 4 :: Views: 2996
If you think about precision frequency reference you should consider a crystal-based generator ..
At that frequency level (500kHz generated by the 555 in astable configuration) you may expect frequency drifts of ≈ +/-1% and that will depend on the quality and type of the used components (mainly C) .. (...)
Elementary Electronic Questions :: 04-28-2006 03:27 :: IanP :: Replies: 7 :: Views: 24852
Take a look at this schematic:
frequency = 1 / ( 0.693*C( R1 + R2 ) )
Elementary Electronic Questions :: 02-07-2006 15:30 :: gliss :: Replies: 2 :: Views: 1361
If your multimeter has "frequency" option you can employ 555 timer and build astabile generator (basic configuration).
In this case capacitance can be calculated from the following equasion:
Elementary Electronic Questions :: 10-25-2005 00:42 :: IanP :: Replies: 4 :: Views: 1648