Supposedly, the sound will vary depending on how much light it is exposed to. I'm getting very little sound out of it (running at 9V), and only when the pot is turned to the lowest possible resistance.
Also, my second 555 (the lower one) is getting VERY hot.
I was making a different circuit once and the same thing happened, 70°+. What happened was I got the battery polarity mixed up. I then replaced the 555 and hey presto, it worked.
kinda cool sounding.
Now I want to build one but using a PIC.
I just started using PIC and want to get into all its apps.
using say 6-8 cds etc?
different caps or ??
I'm running off of wall power (9V adapter), and I checked the board with a multimeter to make sure the +'s and -'s are all straight... and I checked the 555 chips and they're all right-side up. hmm...
Also: I was getting readings as high as 12V (with a 9V adapter??) from the multimeter. Any suggestions why that's happening?
its hard to see if you've wired your citcuit correctly from your photos.
Have you ensured that all your grounds and supplies are connected, by this i mean i see you have used both sides of the breadboard as a +ve rail and -ve rail are all these connected to the power supply +ve and -ve
actually i notice lower 555 has no connection to +ve supply on pin 8 (top right pin) and it should do
A speaker is an inductive load and will cause spikes much higher than the supply voltage hitting directly into the 555 output.
You might try to add an electrolytic cap between output and speaker. (Use 100 to 200µF/35V and connect the positive terminal to the output and the negative to the speaker.)
I got a 100µF electrolytic capacitor and I put it between the pot and the speaker, but I'm still getting the same problem. You said "between the output and the speaker", so I interpreted that as between the pot and the speaker. Did I misinterpret where it should go?
The 555 is not a power amplifier and cannot directly drive an 8 ohm speaker without getting too hot. Add a 6.8 ohm/0.5W resistor in series with the 8 ohm speaker to reduce the current into the speaker. The 6.8 ohm resistor will also keep the pot from burning up.
The 555 is not a power amplifier and cannot directly drive an 8 ohm speaker without getting too hot. Add a 6.8 ohm/0.5W resistor in series with the 8 ohm speaker to reduce the current into the speaker. The 6.8 ohm resistor will also keep the pot from burning up.
I got a 100µF electrolytic capacitor and I put it between the pot and the speaker, but I'm still getting the same problem. You said "between the output and the speaker", so I interpreted that as between the pot and the speaker. Did I misinterpret where it should go?
I just built the circuit from the schematic you attached (with a 82ohm resistor in series with 5k pot) and found i needed to add a small resistance (500ohms) in series with the LDR's and i had to increase the capacitors to 0.1uf to get good variance in sound when i dimmed my lights.