Attached is a PDF of a circuit designed and published on the web by VK4ADC. I am interested in using a simplified version for a noise maker that I need. My need is only for the PICAXE and LM386 portion of the circuit, and I have worked with both the PICAXE and the LM386, but there are a few things in the attached schematic that I would like some input on, expecially in the interface between the PICAXE output and the LM386 input.
1. There seems to be three .1uF caps in the circuit. Are all these required?
2. Are 1N4148 diodes suitable for the two diodes with opposing polarities?
3. He apparently is using a 9V battery to feed a 78L05 to obtain 5V for the PICAXE, but why would he not connect the LM386 directly to the 9V battery?
4. In the RC network, he doesn't identify the second cap. What value should I try?
Here is the link to his project page. http://www.vk4adc.com/web/index.php/picaxe-projects/38-audio-detection/165-picaxe-08m-tone-gen
Thanks in advance.
1. There seems to be three .1uF caps in the circuit. Are all these required?
2. Are 1N4148 diodes suitable for the two diodes with opposing polarities?
3. He apparently is using a 9V battery to feed a 78L05 to obtain 5V for the PICAXE, but why would he not connect the LM386 directly to the 9V battery?
4. In the RC network, he doesn't identify the second cap. What value should I try?
Here is the link to his project page. http://www.vk4adc.com/web/index.php/picaxe-projects/38-audio-detection/165-picaxe-08m-tone-gen
Thanks in advance.
Attachments
-
35.6 KB Views: 22