XPWR136-120
Power transformer for a 120V, 60Hz. line to 500V (250-0-250) at 60mA center tapped and 6.3V (3.15-0-3.15) at 2A center tapped.
TerrySmith wrote:What is the size of this board (L x W)?
The circuit board is 5 inches by 4.2 inches, I just measured it to verify it.
jollyrogr wrote:Hello, I'm interested in this little amp, and thinking about building it. I'm new to this and have a couple questions. 1. How does it sound? Pretty subjective I know, but is it quiet? Better than a push-pull? 2. Any suggestions for speakers to use with this? I'm assuming anything 8ohm that is rather efficient? 3. A few items on your Mouser BOM are on backorder. Are there any substitutions that can be made? I think the POT is an easy one - 20mm shaft is on B.O., 25mm shaft is in stock. Not sure about some of the resistors though.
Thanks
P.S. Small item to note but it looks like on your BOM lists you were trying to include everything. I noticed the fuse holder but the list is missing the fuse itself. I can see from the schematic you had a .75 amp slow blow though.
separks wrote:1) I think it sounds great, and I'll post the frequency response sometime soon. A key factor - particularly for the headphone portion - is noise, and I think the noise performance is superb. Zero hummmmm.
2) I use 91dB efficient speakers in my shop with my Budgie SE. I would consider this a minimum. The Achilles Heel in a design like this is the low frequency (sub 100Hz) distortion caused by the small SE outputs, so higher efficiency speakers alleviate the issue.
3) I'll probably edit the Instant BOM but not the manual for subs. Regarding the pots, I used the ALPS knock-offs on eBay. Same footprint. The Radio Shack pots and Alpha pots will also fit. Whatever the length, some of the shaft will need to be hacksawed off for a close-to-the-chassis fit. Thanks for the fuse heads up.
Shannon
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