Hi all,
Happy New Year from New Zealand. I'm a first time poster in this forum and hoping to get some (perhaps many- if I have time and you have patience) questions answered about a little circuit I have been building over the last couple of days based on this page: http://www.electronicsforu.com/electronicsforu/lab/ad.asp?url=/EFYLinux/circuit/may2003/ci4-clap.pdf&title=Clap%20Switch .
Basically, things aren't working consistently in my finished build. I know that IC1 is doing its thing since the red led comes for three seconds on first clap, but I can't always get IC2 to produce a signal from its output (when measured for voltage on pin 3 when clapping while the red led is still on). I have swapped the two ics around and they both work in IC1 position (despite one being labeled as LM555CN and the other NE555P - should that matter?)
The circuit will sometimes work, but if I disconnect and reconnect power (9v) only IC1 will be functioning again with the red led lighting up once IC1 provides output.
Also wondering, Does it matter that I have used a Tantalum capacitor 0.68uF rather than 0.1uF recommended for C1, and how should I adjust the sesitivity of the microphone? I have also used 0.033uF ceramic caps rather than 0.01uF for C4 & C5?
It is getting quite frustrating that I cant get consistent operation from this circuit. It does work properly sometimes, then if I try a minute later it wont
just noticed some other curious behaviour: when it is working properly, there is the odd time that the green led will just momentarily flicker rather than latch on. How is that possible? I thought that IC3 was acting as a flip flop based on the output of IC2 which is also in monostable operation?
I have probably left out some important other info, but I'll post now or else I'll go barmy trying to do it alone!!
Happy New Year from New Zealand. I'm a first time poster in this forum and hoping to get some (perhaps many- if I have time and you have patience) questions answered about a little circuit I have been building over the last couple of days based on this page: http://www.electronicsforu.com/electronicsforu/lab/ad.asp?url=/EFYLinux/circuit/may2003/ci4-clap.pdf&title=Clap%20Switch .
Basically, things aren't working consistently in my finished build. I know that IC1 is doing its thing since the red led comes for three seconds on first clap, but I can't always get IC2 to produce a signal from its output (when measured for voltage on pin 3 when clapping while the red led is still on). I have swapped the two ics around and they both work in IC1 position (despite one being labeled as LM555CN and the other NE555P - should that matter?)
The circuit will sometimes work, but if I disconnect and reconnect power (9v) only IC1 will be functioning again with the red led lighting up once IC1 provides output.
Also wondering, Does it matter that I have used a Tantalum capacitor 0.68uF rather than 0.1uF recommended for C1, and how should I adjust the sesitivity of the microphone? I have also used 0.033uF ceramic caps rather than 0.01uF for C4 & C5?
It is getting quite frustrating that I cant get consistent operation from this circuit. It does work properly sometimes, then if I try a minute later it wont
just noticed some other curious behaviour: when it is working properly, there is the odd time that the green led will just momentarily flicker rather than latch on. How is that possible? I thought that IC3 was acting as a flip flop based on the output of IC2 which is also in monostable operation?
I have probably left out some important other info, but I'll post now or else I'll go barmy trying to do it alone!!
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