What kind of speaker are you using? I can imagine if you use a 8Ohm speaker, the 555 can get hot!

Try using a different speaker or use a tranistor to let the speaker sound...

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8 ohm is fine. Just be sure you use a decoupling capacitor.

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MechTronics

World of Warcraft is a disease

 

hmm, didn't think about the type of speaker i was using. it's from some disassembled harman kardon speakers. i did think to connect the capacitor with it to test. maybe i just need to complete both timer circuits before i get the proper flow. can't seem to find any real distinguishing marks on the speaker except ST 0B3 or something on the back of the magnet.

 

I guess I'm too old for this stuff, since I have no idea what a punk console is supposed to do.

I do know 555's however, and I have serious doubts the layout as shown will ever accomplish much.


First, the set-up is backwards, I believe. The monostable is supposed to trigger the astable. According to the layout (a very pretty picture, by the way) and Eric's interpretation of the schematic, this circuit attempts to trigger the mono with the astable.

Analyzing the circuit with the 555 Timer Pro computer program, it appears the astable 555 would produce a frequency between 287 Hz at maximum resistance, and 47KHz (20K or so above normal hearing, I believe) with just a small resistance.

If that were to make it to the mono, and to the speaker or jack, the tone would sound for 27 milliseconds at the mid-point of the mono's controlling resistor.

Don't mean to throw cold water on your project, but I feel you have lots of work left getting it to operate. Hope I'm wrong in my analysis, and I'm here to help if I can.

Edit:
Also, the LED will never show very brightly at around l.5 mA current.

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sorry for the lingo term, i realize i really should have used the technical term which is stepped tone generator. it's more commonly made with a 556 but i decided to go for 555 for aesthetic reasons. i probably could save a lot of time and try to convert a 556 shcematic to a dual 555

 

i appreciate the input. i mean i've had doubts from the beginning so no worries, heh. i came here hoping for faults to be pointed out. i'm basing it on various 555 schematics i come across that match up with erics but the 555 has various uses so im probably just getting things mixed up. it's supposed to be a tone generator. the square tone is reminiscent of old video game sound chips so its called atari punk console.

 

hi,
This often happens with circuits from the web, the 'designer' [ a very loose term] never actually builds the project to check any problems that may exist.
Whats more insulting the 'designer' often slaps a copyright notice on the drawing.. don't make me laugh..

Why didnt you use my 'neat' drawing of the original circuit rather than your pencilled hard to read drawing..

Can you explain to an 'old guy' what you expect the output of the circuit to be..??

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

I drew the layout according to your schematic. like i traced the schematic and tried to think how the wires should go, which i got help from other diagrams.

My intentions for the output is analog synth basically, i make electronic music. I intend to use it as a tone source into my computer where everything else is made to which i would alter it further. with the building and research of this box I hope to be better grasp the science and try more and larger projects for same string of use. think of it as me trying to build my own moog. while sure the computers job is to do the same thing but i think we can all agree that there is a different kind of essence to using analog hardware.

 

threads fallen down some pages

i still need to get around figuring a 555 schematic from a 556 circuit

 

found this diagram



you can see compared to mine the flow is backwards but otherwise the placement is the same. it doesnt have anything past the capacitor for output though so idk if i've got that right.

 

hi narcisto,

The two circuits are almost identical, astable driving a monostable.

Which of the two 555's is getting hot and what type of speaker are you using on the output of the monostable.?

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

ive been busy lately so i havent been able to get back to building this and i think im gonna need to restart it again, does the direction from the battery matter like you see in my drawings its on the opposite side as what i just posted.


it was the astable in both cases.

im not sure exactly what type of speaker it is but it was in a preamp harmon/kardon setup, kinda old. ive used connected it to things with a headphone wire before, i thought it'd be usable here. i dont know how many ohms it is

 

Hi,
For a test, connect the pin3 of the astable to the pin2 of the monostable with 470R resistor, not just a piece of wire, lets know if it still gets hot..

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

hi narcisto,
Modify the circuit, add this cap and resistor.

Be aware the astable 555 may have already died.

EDIT:
For the best effect, the output should be connected to an external amplifier.

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

I will try to get to fixing the rest tonight maybe
what is the significance of this change by the way?