Got one of these Algo Duet-Plus 1825(p) in for repair. Complaint: Not making any noise anymore.
Yeah... and nope it wasn't the LM384N audio amp. The warbler IC is the MC34017A-1P. In short, if you press that test button a warble sound comes out that speaker. In my case I injected a tone with my tone generator on pins 2 and 3 on MC34017A and sure enough... sound was getting to pin 6 of the LM384N and amplified out to the speaker.
Hmm... o.k. is the IC getting turned on pin 4 when I press the button? Yep. Is really that warbler IC bad? Sure enough... dead like a door nail.
It's an interesting device. Weird enough for this section.
Yeah... and nope it wasn't the LM384N audio amp. The warbler IC is the MC34017A-1P. In short, if you press that test button a warble sound comes out that speaker. In my case I injected a tone with my tone generator on pins 2 and 3 on MC34017A and sure enough... sound was getting to pin 6 of the LM384N and amplified out to the speaker.
Hmm... o.k. is the IC getting turned on pin 4 when I press the button? Yep. Is really that warbler IC bad? Sure enough... dead like a door nail.
It's an interesting device. Weird enough for this section.
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