Is there a way I can maximize sound volume with the ISD1700 so that I can hear it at least 1 meter away in a room through a 4.5W 8 ohm speaker?
I asked because then I tried using an LM386 with it, I was told that I'd get worse results when I hooked the LM386 to the analog output pin.
So I wondered at first if the analog in section could be improved on. I know it says 0.1uF capacitor but I used 0.047uF because thats what I can get an abundance of dirt cheap and because its more compact and filters out hum better. The good news is I can still record and playback audio with the 0.047uF capacitor. This is what the datasheet says about the analog input:
Now what really gets me is the AGC pin. They say use 4.7uF capacitor between AGC and ground. Here's the datasheet details:
Since I'm recording sound directly from my laptop's earphone output, could I just directly ground this pin to get max gain and adjust the volume from the laptop until I get max volume without distortion, then all my problems be solved? or should I use a lower capacitor value?
or am I thinking this all wrong?
Here's a link to the datasheet:
**broken link removed**
I asked because then I tried using an LM386 with it, I was told that I'd get worse results when I hooked the LM386 to the analog output pin.
So I wondered at first if the analog in section could be improved on. I know it says 0.1uF capacitor but I used 0.047uF because thats what I can get an abundance of dirt cheap and because its more compact and filters out hum better. The good news is I can still record and playback audio with the 0.047uF capacitor. This is what the datasheet says about the analog input:
AnaIn: Auxiliary analog input to the device for recording or feed-through.
An AC-coupling capacitor (typical 0.1uF) is necessary and the amplitude of
the input signal must not exceed 1.0 Vpp. Depending upon the D3 of APC
register, AnaIn signal can be directly recorded into the memory, mixed with
the Mic signal then recorded into the memory or buffered to the speaker
and AUD/AUX outputs via feed-through path.
Now what really gets me is the AGC pin. They say use 4.7uF capacitor between AGC and ground. Here's the datasheet details:
Automatic Gain Control (AGC): The AGC adjusts the gain of the
preamplifier dynamically to compensate for the wide range of microphone
input levels. The AGC allows the full range of signals to be recorded with
minimal distortion. The AGC is designed to operate with a nominal
capacitor of 4.7 µF connected to this pin.
Connecting this pin to ground (VSSA) provides maximum gain to the
preamplifier circuitry. Conversely, connecting this pin to the power supply
(VCCA) provides minimum gain to the preamplifier circuitry.
Since I'm recording sound directly from my laptop's earphone output, could I just directly ground this pin to get max gain and adjust the volume from the laptop until I get max volume without distortion, then all my problems be solved? or should I use a lower capacitor value?
or am I thinking this all wrong?
Here's a link to the datasheet:
**broken link removed**