Power Supply Soft Start (V3)

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
B

bobakrep

Member
Joined 2014
[wiki=Main Page]return to diyAudio Wiki Main Page[/wiki]

[h=Introduction]%2[/h]
The Power Supply Soft Start Board (V3) is available in the DIY audio store. This is an updated version of the Soft Start V2 boards, primarily to make them compatible with the 10x10 grid mounting pattern we've now standardized on (PCB=110mm x 55mm) so they can be easily mounted to Deluxe chassis baseplate, riser panels, front panels and/or heatsinks. Refer to the Soft Start V2 discussion thread for additional information.


This WIKI will attempt to provide instructions and/or guidelines to enable a properly working P/S Soft Start Board (V3).

[h=Build of Materials (BOM)]%2[/h]
{| {{table}}
| align="center" style="background:#f0f0f0;"|'''Qty'''
| align="center" style="background:#f0f0f0;"|'''Reference Designator'''
| align="center" style="background:#f0f0f0;"|'''Value'''
| align="center" style="background:#f0f0f0;"|'''Type'''
| align="center" style="background:#f0f0f0;"|'''Mouser P/No'''
| align="center" style="background:#f0f0f0;"|'''Lead Spacing'''
| align="center" style="background:#f0f0f0;"|'''Notes'''
|-
| 1||C1||0.01uF 1KV||Radial Ceramic||594-S103M47Z5UN63L0R||10mm||C1 should be X2 capacitor type for safety
|-
| 1||C2||1uF 275V||Radial Polypropolene Snubber||80-PHE840MZ7100MF11R||20.3mm, 22.5mm, 23.4mm, 27.5mm||smaller value = longer delay
|-
| 1||C3||1000uF 50V||Radial Aluminium Electrolytic||667-EEU-FC1H102||7.5mm||
|-
|style="background:#0f0f0f;"|
|-
| 1||R1||220R||3W Metal Oxide||667-ERG-3SJ221A||18.4mm||
|-
| 1||R2||1M||3W Metal Film (1/4 W ok)||594-5093NW1M000J||26mm||
|-
| 4||R3, R4, R5, R6||180R||5W Wire Wound||280-CR5-180-RC||26mm||
|-
| 1||R7||2K2||0.5W Metal Film||273-2.2K-RC||9.5mm lead spacing||
|-
|style="background:#0f0f0f;"|
|-
| 4||D1, D2, D3, D4||1N4007||Rectifier 1000Vr 1A||512-1N4007||11.05mm||
|-
| 1||D5||1N4749A||24V 1W Zener Diode||512-1N4749A||11.05mm lead spacing||
|-
|style="background:#0f0f0f;"|
|-
| 1||LED1||Red||5mm Red diffused LED||78-TLHR6400||2.54mm lead spacing||
|-
|style="background:#0f0f0f;"|
|-
| 1||K1||Relay||Relay SPDT 24VDC 15mA||653-G5LA-14-CF-DC24||||poss. replace: G5LE-14-36 DC24
|-
|style="background:#0f0f0f;"|
|-
| 5||||Terminal||30A PCB Screw Terminals||534-8197||5mm||
|-
| ||or||||||||||
|-
| 5||||Terminal||TE Faston Connectors||571-624091||||
|-
|
|}


PDF
XLS.ZIP

[h=Schematic]%2[/h]
An externally hosted image should be here but it was not working when we last tested it.


[h=Picture of a completed P/S Soft Start]%2[/h]
WP_20140110_003.jpg


[h=PCB Change History]%2[/h]
V2.0 - First Production Version
2.0.1 - Added board dimensions
3.0 - New Layout
  • Double sided board
  • Moved AC in and Txfrmr connections to ends of board
  • Added Keystone connectors as option
  • Conforms to 10mm mounting grid

For future changes:
  • Add polarity markers for electrolytic capacitor
  • Add optional fuse between SW2 & R1

[h=Questions]%2[/h]
Question 1:
Will there be any loss of dynamics or timing when playing music with the use of this circuit?
Answer 1:
Once the relay contacts shorts out the load resistors, the transformer will be effectively connected to the mains as if the soft start board ain't there at all so I doubt if any sonic difference will arise from it's use in any amp or preamp project. -Jojo
Question 2:
What is the maximum size toroid that can be started with this soft-start?
Answer 2:
I have been running a 1kva toroid with a combined filter capacitance of about 160kuf for about 3 years now. -Jojo
Question 3:
(placeholder)
Answer 3:
Question 4:
Answer:
Question 5:
Answer:

[h=Suggestions/Tips]%2[/h]
Tip no. 1:
(placeholder)
Tip no. 2:
(placeholder)

Links:
Purchase this P/S Soft Start V3
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom