Hi @bucks bunny , thanks that's really interesting. By the way, will I be better off with four or five batteries ? I don't really understand the relationship between voltage and sound. I know P =v^2/R, which make it seem like voltage is really important, and this is an 8 Ohm speaker....
I'd like to order some 21700's today, but don't know if I should get four or five. Thanks !!
I'd like to order some 21700's today, but don't know if I should get four or five. Thanks !!
Yes, max power output relates to voltage as you stated. But the difference between 4 and 5 cells is not really great. And for practical reasons I use 4 cells (nominal 4x3,7=14,8V). You will find battery holders for 4 cells, but not for 5.
Hi @Galu ! I am going to order this, but they want 20gbp for expedited shipping (i should have ordered it immeidately!) So now my amp budget is up to 40GBP. Is there anything else I should consider for this application ? Thanks !
Not that I can think of. I've not used this amp board myself, but it does look the part. I hope the increased outlay is justified.
Hi ! Is 12mm or 6mm (or a combo) also okay ? I am having trouble finding 9mm. Thanks.
Hi all, here is where I am now.
Please note: The amp will only be used with 1'4" mono cables (shaft is ground, tip is input, no "ring")
@Galu , you discussed bridging in this post : https://www.diyaudio.com/community/...ed-busking-speaker.398808/page-2#post-7340775
I found that white clip with three wires (top left). I will connect the right channel and ground to the 1/4" jack (bottom left), and ground the left channel (should I just ground it to ground on the amp? Should I use the 1k Ohm resistor?) .
Should I just put the 8 Ohm resistor across the left speaker output ? That's not what the diagram below seems to recommend.
The Texas instruments data sheet offers what is seen below. The amp switches to "mono mode" if it is powered up in such a configuration.
If it is easy to accept stereo cables and combine them into a mono input, I wouldn't mind, but I really think it will only be used with mono cables.
Thanks !
Please note: The amp will only be used with 1'4" mono cables (shaft is ground, tip is input, no "ring")
@Galu , you discussed bridging in this post : https://www.diyaudio.com/community/...ed-busking-speaker.398808/page-2#post-7340775
I found that white clip with three wires (top left). I will connect the right channel and ground to the 1/4" jack (bottom left), and ground the left channel (should I just ground it to ground on the amp? Should I use the 1k Ohm resistor?) .
Should I just put the 8 Ohm resistor across the left speaker output ? That's not what the diagram below seems to recommend.
The Texas instruments data sheet offers what is seen below. The amp switches to "mono mode" if it is powered up in such a configuration.
If it is easy to accept stereo cables and combine them into a mono input, I wouldn't mind, but I really think it will only be used with mono cables.
Thanks !
Attachments
I'm afraid I can't comment on the data sheet implementation and how it would be carried out in practice.
If you are going to use the right hand channel only then:
Connect a 1 k ohm; 1/4 W resistor between L in and G on the three pin input connector.
Connect an 8 ohm; 10 W dummy load resistor across L out - and + terminals as you have shown in your above post.
With the input grounded, there will be no output signal on that channel. The dummy load is just there to dampen the output filter.
I have gleaned this information from another thread, but remember I have no hands-on experience with this amplifier board so the decision on whether to follow my recommendations is entirely yours.
However, I am hoping for a satisfactory outcome!
If you are going to use the right hand channel only then:
Connect a 1 k ohm; 1/4 W resistor between L in and G on the three pin input connector.
Connect an 8 ohm; 10 W dummy load resistor across L out - and + terminals as you have shown in your above post.
With the input grounded, there will be no output signal on that channel. The dummy load is just there to dampen the output filter.
I have gleaned this information from another thread, but remember I have no hands-on experience with this amplifier board so the decision on whether to follow my recommendations is entirely yours.
However, I am hoping for a satisfactory outcome!