Teensy Audio Shield question

B

BobLee440

New member
Sorry for the nube question.
The schematic of the audio shield shows a number of passive components.
Are any of those on the audio shield PCBA? For example the caps between what appears to be the line in/out header that is exactly the same shape as the pins on the board. I'm going to assume no.... but just double checking.

Also, what are those little boxes connected to pins 25, 26 and also pin 31. Never seen that one before.

Thanks!
Bob
 
BobLee440 said:
Sorry for the nube question.
The schematic of the audio shield shows a number of passive components.
Are any of those on the audio shield PCBA? For example the caps between what appears to be the line in/out header that is exactly the same shape as the pins on the board. I'm going to assume no.... but just double checking.

Also, what are those little boxes connected to pins 25, 26 and also pin 31. Never seen that one before.

Thanks!
Bob
Click to expand...

@BobLee440: I think it is safe to assume that everything shown in the schematic is on the Teensy Audio Shield.

The boxes shown for pins 25 & 26 of the SGTL5000 indicate a common implementation of optional signal connectivity, allowing you to cut a small trace on the PCB (normally connected), just in case, for any reason, you do not want to route DIN/DOUT to/from the SGTL5000 to/from the assigned Teensy pins (7 & 8). The boxes shown for pin 31 allow you to change the I2C address of the SGTL5000, which would allow you to use two Teensy Audio Shields simultaneously connected to a single Teensy.

Hope that helps . . .

Mark J Culross
KD5RXT
 
Hi Mark. Well geez if I had just looked at the foil I would have seen them! (Use to call them scratch and sniff dots :cool: .
I guess maybe the pot threw me. I know it's optional but it's shown on the schematic.
Then I counted the passives and get 21 same as on the schematic.
Now on to start hooking things up!
Thanks for you help!
Bob (N8LAN)
 
BobLee440 said:
Hi Mark. Well geez if I had just looked at the foil I would have seen them! (Use to call them scratch and sniff dots :cool: .
I guess maybe the pot threw me. I know it's optional but it's shown on the schematic.
Then I counted the passives and get 21 same as on the schematic.
Now on to start hooking things up!
Thanks for you help!
Bob (N8LAN)
Click to expand...
Bob (N8LAN):

Glad to help out. And, you're right about the "volume" pot being optional. Note that, even though the pot is optional, the capacitor across pin 15 of the Audio Shield is actually installed (in case you plan to use pin 15 for an input).

You must make a reliable connection between the two devices. Soldering pins into the Teensy & simply slipping these pins into the holes of the Audio Shield will not work. The Teensy & the Audio Shield work best if connected together with either very short wires, or with pins & header sockets (preferred). I have also soldered pins onto them both & mounted them using mating sockets on a custom PCB where the two devices are located side-by-side. NOTE that it is *not* recommended to hard solder them together. When using them standalone, I personally prefer to put sockets on the Audio Shield & pins on the Teensy. This gets me three advantages:

1) you can still get to the PROGRAM button on the Teensy easily
2) you can plug the Teensy into a prototyping board for other uses when not pairing it with the Audio Shield.
3) I can independently replace either of them in the event of an unfortunate accident

Good luck & have fun !!

Mark J Culross
KD5RXT
 
@kd5rxt-mark Thanks for the advise.
Actually I picked up some extended sockets. I think I will put those on both boards. That way I can stack them either way and they both can independently plug into a breadboard if needed.
 
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