astable548 - help me

Conecting a piezo spkr between SPK+ and SPK- i got a low sound, i need a bigger sound. Its ok to use a 2N3906?

Copy and paste the appropriate tags to share.

Schematic PNGs: (download or hot-link)
small, medium, large

Circuit URL (e-mail, IM, blog, etc.):

CircuitLab forums and comments:

BBCode (many online discussion forums):

Markdown:

HTML:

Open in editor

Conecting a piezo spkr between SPK+ and SPK- i got a low sound, i need a bigger sound. Its ok to use a 2N3906?

You have not said what you need 'Help' with. Experimenting,1) I would replace the Volt meter with an Amp meter. 2) Reverse the polarity of 'D1'. 3) Move 'D1' in series with 'R11' and Amp meter.	by Optionparty September 09, 2012
thanks for reviewing, the description was not saved: Conecting a piezo spkr between SPK+ and SPK- i got a low sound, i need a bigger sound. Its ok to use a 2N3906?	by myfcr September 10, 2012
Your LED, D1 is connect backwards.	by dshaheen September 10, 2012
OK, drawed it backwards.	by myfcr September 10, 2012
The current schematic shows the speaker connected between emitter and base of Q3. So the maximum voltage across the speaker would be VBE of Q3 (~0.7V). I believe Spk- should be connected to the collector of Q3 This should produce a much higher voltage across the speaker and increase the volume.	by dshaheen September 11, 2012

Only the circuit's creator can access stored revision history.

astable548 - help me PUBLIC