Folks, Has anyone come across a multichannel relay "instant mute"/"delay on" small signal PCB? I need one to mount in an electronic crossover to prevent accidental pops and damage to speaker drivers. 6 channels total. There are loads with high current relays, but I need small signal relays. Cheers.
How do you plan to control them? I have small two channel relay boards but you will need a controller. I use arduino Nano on the adapter board for it (own design). My relay boards design is documented here.
Regards,
Oleg
Regards,
Oleg
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Yes, I came across this Arduino name, but have no clue what it means. Basically I imagine connecting the relay delayed “on” circuit (i.e. lift output from ground) to the positive power supply rails, or maybe a separate rectifier. Instant relay “off” (I.e short output to ground) when power is off.
If you prefer to avoid dealing with programming the arduino or other controller there are other purely analog delay circuits. Just search for "relay delay circuit". There are many on the net.
Yes, looked for hours and found lots, but they all use 250v 10A relays. I need small signal relays so any links to such pcbs appreciated!
But a speaker-level DC-fault detector wouldn't be sensitive enough for small signal levels. The whole circuit would need redesignng I think.
Not sure. It should be sufficient with a delay before the crossover output is live, and an instant mute when power to the crossover is lost. DC on the output should not be a problem due to the transformers. I ordered some of those 1 euro delay boards Oleg suggested to see how they might work time and power supply wise. If ok, I can control a battery of of small signal relays...
You could probably go all solid state - see Fig 4 here -
VOM1271 Photovoltaic MOSFET Driver Circuits
Almost the same schematic (using TLP3906 instead of VOM1271)
is used in Post 491 for the Headphone amp DC protection -
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
All you need are the parts to the right of R21 of the schematic in the above post.
It gives you a small delay controlled by C11 and has a really small part count.
Rod Elliott's site has a lot of very useful information -
ESP - MOSFET Solid State Relays
ESP - MOSFET Solid State Relays
VOM1271 Photovoltaic MOSFET Driver Circuits
Almost the same schematic (using TLP3906 instead of VOM1271)
is used in Post 491 for the Headphone amp DC protection -
Ready-to-Run (RTR) SSR DC Speaker Protection and Delay GB
All you need are the parts to the right of R21 of the schematic in the above post.
It gives you a small delay controlled by C11 and has a really small part count.
Rod Elliott's site has a lot of very useful information -
ESP - MOSFET Solid State Relays
ESP - MOSFET Solid State Relays