Progression - A Low Power Desktop Amp
Posted 9th April 2013 at 09:06 PM by BuildMeSomething
Updated 13th April 2013 at 09:21 AM by BuildMeSomething
Updated 13th April 2013 at 09:21 AM by BuildMeSomething
Power supply boards are on their way, as is a full Digikey order for this project. However, no LME49722, which are currently out of stock. Due to that and wanting to keep to a 1 x psu & 1 x amp layout, the amp board underwent a quick re-design. It's now duel mono layout, utilising two LME49990.
Ordered LT1033/LT1085 for the PSU, these should give 3A each [typical]. Plus, six 4,700uf caps to help out. The plan is to run the rails at +/-15Vdc, with a 120VA 2x15V toroidal transformer.
Will place an order for the prototype amp boards on Saturday, just before I go on holiday.
Update (13-04-11): The PSU PCB's still haven't arrived, Plus UPS failed to deliver my Digikey order, this is now in limbo as they're saying "A correct street name is needed for delivery" ... I've talked to both Digi-key & UPS (U.S.) and they have the correct full address, UPS (UK) I can't get hold of... my translation is "Delivery driver can't read a map!"
Worst aspect, I'm off on Holiday next week, so no one here to take deliveries and they'll end up being sent back before I can collect
Update (13-04-12): UPS tracking now saying missed delivery from today even though I was in. And, with no calling card left, I have no UPS InfoNumber [TM] to arrange collection in person or an alternate address... Totally and utterly peeved off ... Next UPS delivery attempt is Monday by 12:00, I'm leaving at 10:30 Monday... fingers crossed.
Update (13-04-13): Amp PCB order has been placed.
Ordered LT1033/LT1085 for the PSU, these should give 3A each [typical]. Plus, six 4,700uf caps to help out. The plan is to run the rails at +/-15Vdc, with a 120VA 2x15V toroidal transformer.
Will place an order for the prototype amp boards on Saturday, just before I go on holiday.
Update (13-04-11): The PSU PCB's still haven't arrived, Plus UPS failed to deliver my Digikey order, this is now in limbo as they're saying "A correct street name is needed for delivery" ... I've talked to both Digi-key & UPS (U.S.) and they have the correct full address, UPS (UK) I can't get hold of... my translation is "Delivery driver can't read a map!"
Worst aspect, I'm off on Holiday next week, so no one here to take deliveries and they'll end up being sent back before I can collect
Update (13-04-12): UPS tracking now saying missed delivery from today even though I was in. And, with no calling card left, I have no UPS InfoNumber [TM] to arrange collection in person or an alternate address... Totally and utterly peeved off ... Next UPS delivery attempt is Monday by 12:00, I'm leaving at 10:30 Monday... fingers crossed.
Update (13-04-13): Amp PCB order has been placed.
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