Switching between Firstwatt F5 and AlephJ

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lykkedk

lykkedk

Member
Joined 2002
Hi All here :)

I am in for building my F5 PCB's into the same chassis, as my alephJ.
I have my idea to try making a "switch" for switching between thoose two amp's.

They will have to share the same binding-posts, PSU and rca's.

Leftover from another project, i have a handfull of some omron G5LA-14-CF 12vdc; the spec. for such an relay is as this :

Coil Resistance: 400ohm
Coil Voltage: 12VDC
Contact Configuration: SPDT
Contact Current: 10A
Contact Voltage VAC: 277V
Contact Voltage VDC: 30V
Product Range: OMRON - G5LA Series
Relay Mounting: Through Hole
Click to expand...

I have attached a schematic, i have been working on today, hoping to have some inputs from here, if i have to change something?

I am hoping, that i without problems, can make a common ground for all the GND connections?

RG; Jesper.

SchmAB-Switch_zpsf8b3c471.png
 
lykkedk

lykkedk

Member
Joined 2002
LoL.. :D

ZenMod!... please ;)

I am aware, that switching cold/hot, is no option. I will make it the way, so
no switching is possible, on the fly ofcause!

The mosfet's, will be drilled very close, to each Amp (F5, AlephJ) heatsinks.

Unfortunately, i have no pictures right here, of the inside of my chassis, but the mosfets, are attached at pure Alu' sinks... so nomatter what, the mosfets will be "hot", if i choose to power the amp. down and switch to other Amp.

I am planning, if neccesisary to also buildin speaker DC-protection/delay... but only when i tried the "clean version" first.

Any things to consider about the GND common connections ???

My chassis:
image_2_zps124d3864.jpeg


Schematics again:
SchmAB-Switch_zpsf8b3c471.png


Just a picture of my bare AlephJ pcb:
null_zpsf33fe4ea.jpg


RG; Jesper.
 
lykkedk

lykkedk

Member
Joined 2002
Haha guy's...

I looked at Nelsons papers, saying that the Alephj dissipates around 200 watt, which must be around 8-9ampere!

So what i need is another relay(s) to switch the PSU from one set of pcb to the other set...

I will look, and see what i can find today in the range 30vdc ~20A or so.

RG; Jesper

ZM... Can you draw mockup of prefered gnd-schm?
 
Zen Mod

Zen Mod

Official Court Jester
Joined 2003
zenmod.in.rs/
Paid Member
lykkkkkk

grounding schm is easy

regarding gnd route :

just make complete wiring of one amp

then make complete wiring of second amp , completely ignoring first one

observe it like this - while one amp is connected to PSU , second one is floating , practically being non-existent

of course - switching is made only on pos and negative rails of both amps, while gnd route is permanent for both
 
lykkedk

lykkedk

Member
Joined 2002
:) ...Cool...

1. So i connect +23 and -23 seperately through relay(s)
2. +In left / +In right (RCA's) into Amp.A / Amp.B will be switched through relays too
3. Spk. out (+only) will be switched from Amp.A / Amp.B
4. Rest is GND, which will be connected as usual.

Well, when i move on, before all is assembled, i will post a picture where i draw in the GND connections...

thanks man!

RG; Jesper.

All messed up ::
6A6C004A-C2E6-4739-9CC7-1BA9E5F5FEF4_zpsk9qkxczo.jpg
 
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