I am designing an LA-2A PCB with two switchable T4B opto cells, to select between a fast and a slower version.
I have attached a schematic of what I've come up with so far along with an original LA-2A schematic for reference.
Basically I am using a pair of DPDT relays to make the switching.
One pole is switching the 0V reference for both the audio LDR and the EL panel in the input section of the T4B. The other three poles are switching the metering section.
I am positive this should work well but a second opinion would be certainly welcome.
I have attached a schematic of what I've come up with so far along with an original LA-2A schematic for reference.
Basically I am using a pair of DPDT relays to make the switching.
One pole is switching the 0V reference for both the audio LDR and the EL panel in the input section of the T4B. The other three poles are switching the metering section.
I am positive this should work well but a second opinion would be certainly welcome.