Tbrick Assembly Instruction.

 

 

Contents

Getting Started.
Assembly
SMT Assembly.
Through-hole assembly
Testing
Connection to Truepath
Drilling Template
Schematic.

Getting Started.

This instruction assumes you are proficient at basic electronics practice including SMT soldering, and troubleshooting.
You need basic electronics tools including a voltmeter.
You need a power supply to test the Tbrick. 12V to 24VRMS or 12V to 36VDC is suitable.
If you get stuck, email audiophool@maedos.com .

 

Assembly

The following description is one way of assembling Tbrick. Experienced assemblers will have their own preference and methodology for assembly.

The two halves of the Tbrick PCB are supplied joined together with a perforation. It is recommended that the two PCBs be kept in this state until after assembly is completed because it is easier to assemble one circuit board than two.

SMT Assembly.

With the Tbrick is supplied a SMT sheet which is a card with all SMT components taped to it. Refer to Figure 1.

Figure 1 SMT Sheet

Instructions:

1. Attach the loaded SMT sheet onto the workbench.

• Use glue or double sided tape. Be sure to stick the area of the SMT sheet which is directly below the SMT components to the workbench, otherwise, when working with the components the SMT sheet may bounce causing components to seemingly disappear.

2. Remove a component from the SMT sheet and solder it to the PCB using the part number shown at the right of the SMT sheet.

• The order of the components is not important, but it is advisable to fit all SMT components before through-hole components.
  • One Tbrick builder suggests that it is easier to solder SOT-23 transistor Q11 before soldering 0805 resistors R11 and R12.
• Refer to Figure 2 for clarification on orientations of some of the SMT Components.

Figure 2 SMT Component Orientation

Through-hole assembly

Instructions.

1. Solder all the through-hole components onto the PCB. Refer to Table 1

• The order of components is not important.
• Decide whether you want the Power and ERR LEDs to be fitted to the front panel of your amp (Refer to Figure 3).   If not, optionally solder the included Red LED to J51 ERR LED location in the orientation shown in figure 3 J51.

 

• Be sure not to confuse the two large regulator ICs. They look very similar except Q31 is marked LM317 and the other Q41 is marked 7810
• C31 is the large electrolytic capacitor which is located just beside the TO-220 regulator Q31. Depending on your heatsink arrangement and tools, it may be worth mounting the C31 slightly above the PCB so that it can be leaned away from Q31 when Q31 is being connected to its heatsink.

 

Count	Value	Footprint	Designator	Description	Comment
1	7810	78xxT	Q41	Positive-Voltage Regulator	VN10
1	0 ohms	AXIAL-0.4	R21	Resistor	Wire link
1	100uF	CAPRAD0.1	C35	Capacitor	V5
1	470uF	CAPRAD0.2	C44	Capacitor	VN10
2	10uF Tant	CAPRAD0.1	C33	Capacitor	VN5 Reg
	10uF Tant	CAPRAD0.1	C34	Capacitor	VN5 Reg
1	200mA		F31	Fuse	V5
1	500mA		F41	Fuse	VN10
2 pr	Fuse skt	Fuse20mm			V5
	Fuse skt	Fuse20mm			VN10
1	2200uF	CAPRAD0.2	C41	Capacitor	VN10 bulk cap
1	4700uF	CapRad0.3	C31	Capacitor	V5 bulk cap
1	47uF	CAPRAD0.1	C13	Capacitor	Unmute delay cap
1	4N38	DIP-6	U12	Optoisolator	Mute isolator
2	HDR1X2	HDR1X2	J31	Header, 2-Pin	12Vac for V5
	HDR1X2	HDR1X2	J41	Header, 2-Pin	12Vac for VN10
1	LM317	LM317T	Q31	3-Terminal Adjustable Regulator	V5
1	LM317L	Lm317LTO92	Q32	Positive Voltage Regulator	for V5
4	PhoenixV2	PhoenixV2	J21	Header, 2-Pin	Audio
	PhoenixV2	PhoenixV2	J22	Header, 2-Pin	Auidio
	PhoenixV2	PhoenixV2	J23	Header, 2-Pin	Auidio
	PhoenixV2	PhoenixV2	J24	Header, 2-Pin	Auidio
4	PhoenixP2		J21	Plug, 2-Pin
	PhoenixP2		J22	Plug, 2-Pin
	PhoenixP2		J23	Plug, 2-Pin
	PhoenixP2		J24	Plug, 2-Pin
1	relay8A	relay8A	X21	Dual-Pole Dual-Throw Relay
2	W04	BridgeW04	D31	Bridge Rectifier	V5
	W04	BridgeW04	D41	Bridge Rectifier	VN10
1	Red Led		JP51		ERR Led (Optional)
2	30cm plug/cable		J31		12Vac for V5
	30cm plug/cable		J41		12Vac for VN10

Table 1 Parts List - Through-hole

Standalone Testing

Do this test on the individual Tbrick PCBs before they are connected to the Truepath

Test the V5 PCB:

• Connect 12Vac to J31
• The green V5 power indicator LED should come on.
• Check that there is 5VDC between 5V and AGND pins of J32.
  
  

Test the VN10 PCB:

• Connect 12Vac to J41
• The green VN10 power indicator LED should come on.
• The ERR adn PWR LEDs (if fited) shoud also come on.
• Check that there is 10VDC between VN10 and VNN pins of J42.

Connection to Truepath.

Now is time to separate the two PCBs. Simply align the perforation along the edge of your workbench and gently press, rocking back and forth until the PCBs separate.

Connect the Tbrick to the pre-tested Truepath as shown in Figure 3 and Figure 4

Figure 3 Tbrick wiring diagram

Figure 4 Tbrick fitted to Truepath in TFAB Configuration

Final Testing

After the Tbrick is connected to the pre-tested Truepath, the final test can be carried out.

• Remove the input singal and the speakers.
• Switch the amplifer on.
• One second after the red Trueapth Mute LED goes off, output relay will click and the ERR LED will go off.
• Switch off all power and connect the input signal and speakers.
• Switch the amp back on and listen to the music.
• Note that for good measure the DC offset on the amp should be checked annually.

Tbrick Schematic

Figure 5 Tbrick Schematic - Click drawing for high res pdf

 

Drilling Template

Drill holes in locations indicated for fitting Tbrick and Truepath into an enclosure.

Hole locations for mounting MOSFETs to the base of the enclosure are also shown. Drill these holes if you want to use the enclosure baseplate as a heatsink.