Working without a timer IC.
Is it possible to accomplish what is happening here,
http://www.kpsec.freeuk.com/projects/dummy.htm
with just resistors, capacitors without using the 555 timer IC.
Thank you.
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M$5 Answers
A resistor/capacitor oscillator still requires an outside pulse in order to oscillate, so you would need a much more involved circuit to make it standalone. If you wanted to try your hand at it, try the colpitts oscillator circuit
http://en.wikipedia.org/wiki/Colpitts_oscillator
OR you could make an Astable circuit. An Astable can be made with just afew caps, resistors and transistors. very easy, very tidy. This is basically one of the 555's modes- it operates as either an astable or monostable oscillator.
http://www.play-hookey.com/digital/experiments/rtl_astable.html
Might have to experiment to find a suitable oscillation rate for your purposes, but it will work,
Enjoy
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M$
The 10k resistors control how long it takes for the capacitor to charge up which then feeds to the transistor, which then criss crosses to another identical circuit. This circuit flashes 2 leds alternately. However you dont have to switch on led's. You can switch whatever you want.
You could for example feed a tone generator, which also doesnt require a 555 timer.
For example:
http://www.aaroncake.net/circuits/torgan.asp
You switch your power through 1 of 8 resistors which determines which musical note is heard.
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M$
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M$
I know this doesn't answer your question regarding whether or not you can use just resistors and caps, but you can save some time by just ordering the chip online.
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M$The 7555 is designed to cause less supply glitching than the classic 555 and the manufacturer claims that it usually does not require a "control" capacitor and in many cases does not require a power supply bypass capacitor. It has been claimed that the 555 gets its name from the three 5 kΩ resistors used in typical early implementations,but Hans Camenzind has stated that the number was arbitrary.The part is still in wide use, thanks to its ease of use, low price and good stability. As of 2003update, it is estimated that 1 billion units are manufactured every year.Depending on the manufacturer, the standard 555 package includes over 20 transistors, 2 diodes and 15 resistors on a silicon chip installed in an 8-pin mini dual-in-line package (DIP-8). Variants available include the 556 (a 14-pin DIP combining two 555s on one chip), and the 558 (a 16-pin DIP combining four slightly modified 555s with DIS & THR connected internally, and TR falling edge sensitive instead of level sensitive).Ultra-low power versions of the 555 are also available, such as the 7555 and TLC555.
The 7555 is designed to cause less supply glitching than the classic 555 and the manufacturer claims that it usually does not require a "control" capacitor and in many cases does not require a power supply bypass capacitor.Further reading:http://www.seekic.com
http://www.chinaicmart.com
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M$
Thank you. Your answer was very helpful.