It didn't explode....... YET (aka niges amp)

[Fran]

Output relays went in today and seems to work very well. As it sits right now, there's a delay of about 15s at turn off and the little turn off pop that was there is take care of.


Voltmeters next.

[nige2000]

i could not detect sq loss with early speaker relay prototypes
are we still good?

[Fran]

We are still good. No SQ loss that I can detect.

I noticed the relays do get slightly warm - they are probably the warmest thing in the whole amp - and even at that they are probably only 35degC. That was after it had been on for hours and hours yesterday.

Voltmeters next.

[jkeny]

We are still good. No SQ loss that I can detect.

I noticed the relays do get slightly warm - they are probably the warmest thing in the whole amp - and even at that they are probably only 35degC. That was after it had been on for hours and hours yesterday.

Voltmeters next.

The heat is due to the voltage/current needed to turn them on & keep them on - I presume they are non-latching relays
One way of overcoming this would be to use latching relays but would need to figure out a way of turning relay off - reversing voltage polarity to control pins

[Fran]

they're simple non-latching relays John - yes, its just the coil current I think. I don't think its worth the redesign it would take to change to non-latching. Ah its hardly a problem - just pointing it out for others when they go at it themselves.

[nige2000]

We can try changing the relay signal resistor for a higher value

[Fran]

Voltmeters went in tonight - switched them on the positive so they're off at the flick of a switch. Powered off a mid point around 14V (although there was no difference in brightness from 4V up. Simple little double pole toggle switch needed.

[nige2000]

what no video?
Ah...

[Fran]

Gwan so

[Sligolad]

Great job Fran....excitement is mounting!!