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justin

Manufacturer/MoT
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justin last won the day on May 2 2019

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  • Birthday 06/27/1983

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  1. Before you do anything, clean the inside of the amplifier
  2. I have seen 1 or 2 pairs need replacements but i think they are ones that were all early production
  3. keep in mind the thermal transfer for this package is not great, with a good insulator the IC will be 3C/W hotter than the heatsink. so you do need to keep the heatsink cool. temperature in this case with the RAAL is dependent on music and how loud you're listening. My guess is in most uses the heatsink will not exceed 40C. with no audio it will be room temp. so if the heatsink reaches 40C w/ an average of 15W per IC then the IC temp will be around 85C There is also the TO-3 package @ $150 ea. and Apex has parts of a similar price
  4. I received a suggestion that the grounds for the L/R output, which in this case is the 4-pin XLR but would also be the negative posts on the speaker terminals, be wired back to each L/R channel board rather to the star ground at the switching PSUs open for debate on that
  5. can try but it will be limited by voltage swing. 25W/8-ohm and 50W/4-ohm as of right now here is where the difficult work actually starts, and the time consuming work. I'd be interested if anyone wanted to finish it up before putting in the $$/cost on their own unit. for future board revisions: - make the jumper over the bass boost 3x 0.1" pins so a push-on jumper can be used + have a place to store it and/or add small signal DPDT 24v relay to switch it (add a 2nd value with moar boost?) - don't block the heatsinked part mounting screws with the electrolytic caps - holes for wires too small to accommodate 16awg, used 20awg instead - caddock resistors need to be bent in an L, move them closer to edge of pcb if possible - 2nd output hole for wiring another output
  6. RAALstar v0.1 with one of Ray's old test discs raalstar.mov
  7. mine are complete at allpcb using those files. shipping on hold to combine w/ a different order
  8. nope, i ordered 2oz for a prototype
  9. oops..one mistake. the tantalum caps (10uf) should probably be ceramic such as RCER71H106MWK1H03B or use the tantalum ones and bypass with a .1uf c0g under the board such as RDE5C1H104J2K1H03B
  10. Mouser #: 595-OPA541AP Mfr. #: OPA541AP Desc.: Operational Amplifiers - Op Amps Operational Amplifiers - Op Amps Hi-Power Monolithic Op Amp 4 $21.40 $85.60 4 Shipped 06-Aug-20 57782631 Mouser #: 80-T354G106K035AT Mfr. #: T354G106K035AT Desc.: Tantalum Capacitors - Solid Leaded Tantalum Capacitors - Solid Leaded 10.0uF 35.0V10% 10 $1.28 $12.80 10 Shipped 06-Aug-20 57782631 Mouser #: 710-860160575031 Mfr. #: 860160575031 Desc.: Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded WCAP-ATLL 35V 1000uF 20% Radial 4 $1.29 $5.16 4 Shipped 06-Aug-20 57782631 Mouser #: 581-SR212A200JAR Mfr. #: SR212A200JAR Desc.: Multilayer Ceramic Capacitors MLCC - Leaded Multilayer Ceramic Capacitors MLCC - Leaded 200V 20pF 5% C0G 4 $0.45 $1.80 4 Shipped 06-Aug-20 57782631 Mouser #: 505-MKP20.022/100/5 Mfr. #: MKP2D022201B00JSSD Desc.: Film Capacitors Film Capacitors 100V .022uF 5% 2 $0.48 $0.96 2 Shipped 06-Aug-20 57782631 Mouser #: 71-RN55C6501B Mfr. #: RN55C6501BB14 Desc.: Metal Film Resistors - Through Hole Metal Film Resistors - Through Hole 1/10watt 6.5Kohms .1% 50ppm 2 $0.61 $1.22 2 Shipped 06-Aug-20 57782631 Mouser #: 71-RN55C-B-10K Mfr. #: RN55C1002BB14 Desc.: Metal Film Resistors - Through Hole Metal Film Resistors - Through Hole 1/10watt 10Kohms .1% 50ppm 10 $0.999 $9.99 10 Shipped 06-Aug-20 57782631 Mouser #: 709-UHP-350-24 Mfr. #: UHP-350-24 Desc.: Switching Power Supplies Switching Power Supplies 350.4W 24V 14.6A W/ PFC 2 $67.31 $134.62 2 Shipped 06-Aug-20 57782631 Mouser #: 684-MP930-0.1 Mfr. #: MP930-0.10-1% Desc.: Thick Film Resistors - Through Hole Thick Film Resistors - Through Hole 0.1 ohm 30W 1% TO-220 PKG PWR FILM Qty 4
  11. i have 5 on the way, but i don't know how many i'll blow up yet. you should use allpcb though, it's like $1.99 for new customers to order these
  12. I like how a heatsinked 3U chassis is now the modest build answer
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