NEW PREAMP DESIGN
- Thread starter GeorgeP
- Start date
Peak detector working nice. Added a sensitivity switch for lower listening levels...1V RMS is max...10V RMS is max for the preamp (30vac peak to peak).
Im adding a very low distortion 10 watt/channel stereo amp option / power supply option for bedroom speakers. Just a plug in. Remove preamp only supply, and plug this in, and add output binding posts a on rear. Making it an easy addition...so the Rev-P2 preamp board getting the needed connectors for either option. Also added a balance control, and moved the AC on switch off the pcb. Saw a low level hum on the left channel...so thats fixed. The new balance control will be to the left of the volume control. The Ambience control, to the right of the volume control. Nice.
Ill upload a better pick of the front panel control locations later.
Headphone jack will be on right side.
Box is 16" wide, 2" high, 8" deep. All black painted steel. Knobs will be silver.
Im starting to drill the box to put the circuits in. This pic shows the LED Peak level indicators...pcb is on inside of course! Just a pic for reference. Vertical pcb and contol heights for drilling holes.
Im adding a very low distortion 10 watt/channel stereo amp option / power supply option for bedroom speakers. Just a plug in. Remove preamp only supply, and plug this in, and add output binding posts a on rear. Making it an easy addition...so the Rev-P2 preamp board getting the needed connectors for either option. Also added a balance control, and moved the AC on switch off the pcb. Saw a low level hum on the left channel...so thats fixed. The new balance control will be to the left of the volume control. The Ambience control, to the right of the volume control. Nice.
Ill upload a better pick of the front panel control locations later.
Headphone jack will be on right side.
Box is 16" wide, 2" high, 8" deep. All black painted steel. Knobs will be silver.
Im starting to drill the box to put the circuits in. This pic shows the LED Peak level indicators...pcb is on inside of course! Just a pic for reference. Vertical pcb and contol heights for drilling holes.
If I may make a suggestion, George:
Increase the diameter of the volume control. A few beers in and you'll be turning the wrong knobs.
I see how you laid this out with the controls, but I would probably still locate the main gain knob on its own on one side (even if a timing belt inside operates the pot in the optimal location). But a true resistor ladder stepped attenuator is SO much quieter than a pot I don't expect to ever design an enclosure with a potentiometer ever again. It's night and day.
Increase the diameter of the volume control. A few beers in and you'll be turning the wrong knobs.
I see how you laid this out with the controls, but I would probably still locate the main gain knob on its own on one side (even if a timing belt inside operates the pot in the optimal location). But a true resistor ladder stepped attenuator is SO much quieter than a pot I don't expect to ever design an enclosure with a potentiometer ever again. It's night and day.
A stepped attenuator...nice. I'll check. Could also be a digital encoder for a D to A analog converter. To complicated. Then...you can use a remote for drunken dudes who wont get off the couch! Lol. These pots sound nice and feel nice, and can be easily cleaned if needed. Not sure if the came style knob comes a bit larger. Ya could always out a big bold black "V" on it... Lol. I did place it at the center... under my Logo!
For sure you can use a remote with a few relays and resistors to create a remote attenuator. I think there are kits on eBay that could be grafted in. Selection can be handled similarly.
I suspect an AP could drive a Bluetooth module and you could have a clean faceplate with no knobs at all if you wanted; operate from any smartphone. That way you are not likely to lose the remote.
I prefer actual switches and like the discussions on AK about Wyn’s new design if I get up to flip a record I can get up to adjust the equipment.
I suspect an AP could drive a Bluetooth module and you could have a clean faceplate with no knobs at all if you wanted; operate from any smartphone. That way you are not likely to lose the remote.
I prefer actual switches and like the discussions on AK about Wyn’s new design if I get up to flip a record I can get up to adjust the equipment.
- Joined
- Nov 1, 2014
- Messages
- 3,507
- Location
- Gaston, SC
- Tagline
- Victim of the record bug since age five
- Joined
- Nov 1, 2014
- Messages
- 3,507
- Location
- Gaston, SC
- Tagline
- Victim of the record bug since age five
- Joined
- Nov 1, 2014
- Messages
- 3,507
- Location
- Gaston, SC
- Tagline
- Victim of the record bug since age five
Diff pairs are run on board to board connections inside switches and servers, not easy to implement but is done.
32G fiber channel and 56G IB are common PCB runs as well as Gen5 PCIe running nearly double that rate. When it has to span to a peer board, those runs can be quite long.
Cables and board are required to handle these transmission speeds. Length hurts so keeping runs as short as possible minimizes losses.
32G fiber channel and 56G IB are common PCB runs as well as Gen5 PCIe running nearly double that rate. When it has to span to a peer board, those runs can be quite long.
Cables and board are required to handle these transmission speeds. Length hurts so keeping runs as short as possible minimizes losses.