ODS - any advice?

[martin manning]

That 12V supply would be more than adequate for half dozen relays of the type I prefer. Unclear what the concerns are that you have Martin.

It was the talk about running a pedal from the relay circuit I was referring to. One could do 9V relays and add a DC power jack.

[didit]

That 12V supply would be more than adequate for half dozen relays of the type I prefer. Unclear what the concerns are that you have Martin.

Hi Ian, what are the type you prefer?

I also found this https://grangeramp.com/product/3-relay- ... d-ver-2-2/

The Omron G5V-2-H1-DC12, which is spec'd for 12V@12.5mA on the coil. Similar equivalents available from other manufacturers. Mouser has them, and is where I've purchased. That board kit looks like a reasonable option. My only small concern is that it seems wide and space tucked in the ODS chassis is tight.

It was the talk about running a pedal from the relay circuit I was referring to. One could do 9V relays and add a DC power jack.

Ah yes, OK---for even a few pedals 1.5-2A would be good.

Best .. Ian

[Stephen1966]

I agree, nice compact board. Read the spec sheet to see max current draw vs. chosen output voltage, though.

So let me see if I have this straight...
I=V/R
I = current needed to turn on a relay coil. (in amps)
V= applied voltage across relay coil (in volts)
R= resistance of relay coil (in ohms)

If I take a couple of offerings from Tube Town stock we have the Fujitsu/Takamisawa, RY-12W-K, DPDT, 12V (1.25A) the Finder Relay DPDT, 125V 2A, 12V (2A) and compare it with the NTE R40-11D2-12 (2A) named as an alternative for the Taiko RKTS 12G for which, there doesn't appear to be a datasheet.
The NTE relay has a coil resistance of 960Ohm (12V@12.5mA)
The Fujitsu also has a coil resistance of 960Ohm (12V@12.5mA)
The Finder has a coil resistance of 720Ohm (12V@16.7mA)
This doesn't take account of minimum switching voltages nor for manufacturing variations of the nominal coil resistance data but if the 12V power kit offers a maximum output current of 166mA it appears to have plenty in reserve for a handful of relays. The NTE seems like the best choice. Maybe I'm missing something, or I don't understand the issue correctly.

Stephen

[Stephen1966]

That 12V supply would be more than adequate for half dozen relays of the type I prefer. Unclear what the concerns are that you have Martin.

Hi Ian, what are the type you prefer?

I also found this https://grangeramp.com/product/3-relay- ... d-ver-2-2/

The Omron G5V-2-H1-DC12, which is spec'd for 12V@12.5mA on the coil. Similar equivalents available from other manufacturers. Mouser has them, and is where I've purchased. That board kit looks like a reasonable option. My only small concern is that it seems wide and space tucked in the ODS chassis is tight.

It was the talk about running a pedal from the relay circuit I was referring to. One could do 9V relays and add a DC power jack.

Ah yes, OK---for even a few pedals 1.5-2A would be good.

Best .. Ian

The Granger board kit, they say, can be split. Useful perhaps if real estate is limited.

[martin manning]

No problem if you are just running relays and LED's. Sounds like you are going with 12V relays, so for each one you need 12.5 mA for the coil plus say 15 mA for each LED, that's 27.5 mA for each function. With 166 mA available you could power six relays.

[Stephen1966]

Just a thought, has anyone seen a solid state alternative to the 12V 2A 2 pole relays? I couldn't find any = quick search!

Edit - '2 pole', I meant DPDT

[didit]

The Granger board kit, they say, can be split. Useful perhaps if real estate is limited.

It was width not length that appear the making of something awkward. My boards purchased long ago from a forgotten source are 20mm wide with mounting at 45mm centres. The Granger docs provide no dimensioning detail but appear to be >30mm wide.

Best .. Ian

[Stephen1966]

The Granger board kit, they say, can be split. Useful perhaps if real estate is limited.

It was width not length that appear the making of something awkward. My boards purchased long ago from a forgotten source are 20mm wide with mounting at 45mm centres. The Granger docs provide no dimensioning detail but appear to be >30mm wide.

Best .. Ian

Ah yes, they all tell you that length is not a problem But seriously, perhaps that's why Granger associate these boards with the D-Lite.

[Lothy]

Ah yes, OK---for even a few pedals 1.5-2A would be good.

Best .. Ian

For a Compressor or a Tubescreamer and a simple Belton brick reverb pedal? With both I'm less than 80 mA. Let's say 100 + 60 for 2 relays & LEDs + a 7809. Ok, it's pretty close, but it's a conservative calculation. I would not hook up the Strymons, I don't have .

Cheers
Gerhard

[didit]

Ah yes, OK---for even a few pedals 1.5-2A would be good.

Best .. Ian

For a Compressor or a Tubescreamer and a simple Belton brick reverb pedal? With both I'm less than 80 mA. Let's say 100 + 60 for 2 relays & LEDs + a 7809. Ok, it's pretty close, but it's a conservative calculation. I would not hook up the Strymons, I don't have .

Cheers
Gerhard

Sure, that makes sense. Up close to the edge but probably OK. I'd recommend the regulator for the 9V conversion be down inside the floor switch box end putting the 12V directly down the cable. Would use a recent efficient switch-mode converter rather than brute 7809, and at least 50uF capacitor on the output side. And truth told, if it was a new build up the overall supply to 24V with matching relays.

Best .. Ian

[Lothy]

if it was a new build up the overall supply to 24V with matching relays.

Best .. Ian

Thank you Ian.
What I have learned from engeneering topics and from guitar playing: It can allways be done better.. (ok, that was Henry Ford, I suppose...)
What are the benefits of a 24V relay?
If this one fails, I was thinking about a switching PS with more current output. Size does matter a bit in this small chassis...

Cheers
Gerhard

[didit]

if it was a new build up the overall supply to 24V with matching relays.

What are the benefits of a 24V relay?
If this one fails, I was thinking about a switching PS with more current output. Size does matter a bit in this small chassis...

No big benefit to 24V relays. The benefits are in your connection from amp down to floor pedal, which has resistance and other circuit properties. With a higher voltage there be less overall power loss, presuming you use a switch-mode version for that local DC-DC converter. Also, with that localized "point-of-use" regulator/converter (including adequate capacitance etc) you will have better power stability and much less potential noise fed into the pedals.

Did that clarify?

Best .. Ian

[Lothy]

Thank you, Ian.
Gerhard

[Stephen1966]

Happy New Year everyone, it's great to be back. I took a bit of time out to finish my new guitar (I've posted a couple of pics over at https://ampgarage.com/forum/viewtopic.php?f=7&t=34113, but I'm back now and turning my focus to the ODS.

I've read a few posts here about builders who had experimented with digital reverb in their ODS builds and it's an effect I would like to include in my sessions on a fairly regular basis. The posts I read were quite old, with dead links and outdated products in some cases. I'm just curious if anyone had recently experimented with an onboard SS reverb or even if, via a dumbleator, there is more to be gained by going for a pedal like the TC Electronics Hall of Fame 2, or the EHX Oceans 11 Reverb. Modest effects granted, but enough to keep me happy. I'm pretty new to the reverb scene and my early searches for more info went down the path of the Belton brick but am I right in assuming it's fairly static, delay-wise?

Stephen

[norburybrook]

Happy New Year everyone, it's great to be back. I took a bit of time out to finish my new guitar (I've posted a couple of pics over at https://ampgarage.com/forum/viewtopic.php?f=7&t=34113, but I'm back now and turning my focus to the ODS.

I've read a few posts here about builders who had experimented with digital reverb in their ODS builds and it's an effect I would like to include in my sessions on a fairly regular basis. The posts I read were quite old, with dead links and outdated products in some cases. I'm just curious if anyone had recently experimented with an onboard SS reverb or even if, via a dumbleator, there is more to be gained by going for a pedal like the TC Electronics Hall of Fame 2, or the EHX Oceans 11 Reverb. Modest effects granted, but enough to keep me happy. I'm pretty new to the reverb scene and my early searches for more info went down the path of the Belton brick but am I right in assuming it's fairly static, delay-wise?

Stephen

for grab and go I use one of these:

https://www.nuxefx.com/atlantic.html

Cheap and sounds great, delay and reverb in one pedal. I built a combo with a 9v supply built into the footswitch so I could just plug this in without any extra mains cables. Just a send and return to the amp. I had a dumbleator built in but this pedal will do line level as well . YOu can also switch to serial or parallel modes and have the reverb or delay in any order.


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