There is a conflict with pins 5, 6 and 7. With pin 6 being higher than pin 5, pin 7 should be very near 0v.
Are all of the original parts in place and all added parts (100k resistor) removed?
Are all of the original parts in place and all added parts (100k resistor) removed?
Pin7 & Pin8 are not shorted.
The voltage is originating on Pin 4 of the 4013 which connects to 12v through a 2.2k (RS7) resistor as per the diagram
The voltage is originating on Pin 4 of the 4013 which connects to 12v through a 2.2k (RS7) resistor as per the diagram
The 17358 would be capable of pulling that 2.2k to ground.
Did these 17358s come from a reputable distributor?
Did these 17358s come from a reputable distributor?
The 17358 is capable of taking input at the voltage of the negative rail without error. The 4558 probably isn't.
Do you have an LM293/393?
Do you have an LM293/393?
With a multimeter, using the primary ground as the reference, what's the DC voltage on each speaker terminal?
Are there any solder bridges (intentionally made) on any of the audio op-amps?
Are there any solder bridges (intentionally made) on any of the audio op-amps?
The relay is not engaging, the 17358 i removed was from the protection circuit, installed the 4558 in place...
as per the diagram, there should be an LM2904 there. I have a 2903 on hand, would i be able to use that?
as per the diagram, there should be an LM2904 there. I have a 2903 on hand, would i be able to use that?
pin1 : 1.3v
pin2 : 4.5v
pin3 : 2.5v
pin4 : 0.00v
pin5 : 1.3v
pin6 : 4.8v
pin7 : 1.4v
pin8 : 12.5v
reply to #92
neg terminal: 32.6v
pos terminal: 32.3v
pin2 : 4.5v
pin3 : 2.5v
pin4 : 0.00v
pin5 : 1.3v
pin6 : 4.8v
pin7 : 1.4v
pin8 : 12.5v
reply to #92
neg terminal: 32.6v
pos terminal: 32.3v
Hi Perry,
I have replaced the 4558 with an LM358
Im getting 18.5v on the speaker terminals, tried to adjust the 500k pot but it doesn't change the voltage
when i connect a speaker, there are pulses coming through.
I have replaced the 4558 with an LM358
Im getting 18.5v on the speaker terminals, tried to adjust the 500k pot but it doesn't change the voltage
when i connect a speaker, there are pulses coming through.