--- a/bom.txt +++ b/bom.txt @@ -1,9 +1,6 @@ Parallel JTAG (Wiggler) - BOM -- - -Parts Quantity - Capacitors @@ -44,97 +41,5 @@ (1) 2N3904 transistor (1) DO-41 diode, 1N4004 to 1N4007 (1) barrel jack, 5.5mm x 2.1mm, female, 3 prong -(1) DPDT ON-ON switch, 2.54mm pin spacing +(1) DPDT ON-ON switch, 2.54mm x 5.08mm pin spacing (2) LM1117T-ADJ or LD1117 LDO regulator - --- - -Components - - -JTAG Section - -J1 - DSUB-25 Connector, Right Angle, Male [1] -P1 - 2 pin header -P2 - 3 pin header -P3 - 8 pin header -U1 - 74HCT244 octal buffer/line driver [2] -Q1 - 2N3904 transistor [3] -D1 - 5mm LED, Yellow (VREF power indicator) -C1 - Ceramic or Film cap, 100nf (output voltage filter) -R1 - 1/4W resistor, 10K (to 2N3904, base) -R2 - 1/4W resistor, 100 (to 74HCT244, 1A0) -R3 - 1/4W resistor, 100 (to 74HCT244, 1A1) -R4 - 1/4W resistor, 100 (to 74HCT244, 1A2) -R5 - 1/4W resistor, 100 (to 74HCT244, 1A3) -R6 - 1/4W resistor, 100 (from 74HCT244, 2Y0) -R7 - 1/4W resistor, 47K (to 2N3904, base to emitter ground) -R8 - 1/4W resistor, 2K2 (TMS power tap, current limiter) -R9 - 1/4W resistor, 2K2 (TCK power tap, current limiter) -R10 - 1/4W resistor, 2K2 (TDI power tap, current limiter) -R11 - 1/4W resistor, 2K2 (nTRST power tap, current limiter) -R12 - 1/4W resistor, 100 (from 2N3904, collector to nSRST) -R13 - 1/4W resistor, 100 (to 74HCT244, 2A0, TDO) -R14 - 1/4W resistor, 100 (from 74HCT244, 1Y3, nTRST) -R15 - 1/4W resistor, 100 (from 74HCT244, 1Y2, TDI) -R16 - 1/4W resistor, 100 (from 74HCT244, 1Y1, TCK) -R17 - 1/4W resistor, 100 (from 74HCT244, 1Y0, TMS) -R18 - 1/4W resistor, 1K (nSRST pullup resistor) -R19 - 1/4W resistor, 330 to 5K1 (VREF LED current limiter) [4] - - -Dual Power Supply Section - -J2 - Barrel Jack, 5.5mm x 2.1mm, female, 3 prong (VCC) -SW1 - DPDT ON-ON switch, 2.54mm pin spacing (3V3/5V0 power switch) -U2 - LM1117T-ADJ or LD1117 LDO regulator (3V3 power supply) -U3 - LM1117T-ADJ or LD1117 LDO regulator (5V0 power supply) -D2 - 5mm LED, Green (3V3 power indicator) -D3 - 5mm LED, Red (5V0 power indicator) -D4 - DO-41 diode, 1N4004 to 1N4007 (protection diode) -C2 - Electrolytic cap, 100uf 16V (3V3 power supply in filter) -C3 - Electrolytic cap, 100uf 6.3V (3V3 power supply adj to out filter) -C4 - Electrolytic cap, 100uf 6.3V (3V3 power supply out filter) -C5 - Electrolytic cap, 100uf 16V (5V0 power supply in filter) -C6 - Electrolytic cap, 100uf 6.3V (5V0 power supply adj to out filter) -C7 - Electrolytic cap, 100uf 6.3V (5V0 power supply out filter) -R20 - 1/4W resistor, 330 (3V3 power supply adj) -R21 - 1/4W resistor, 200 (3V3 power supply out) -R22 - 1/4W resistor, 330 to 5K1 (3V3 LED current limiter) [4] -R23 - 1/4W resistor, 680 (5V0 power supply adj) -R24 - 1/4W resistor, 220 (5V0 power supply out) -R25 - 1/4W resistor, 330 to 5K1 (5V0 LED current limiter) [4] - - -Notes - -[1] The US standard is preferred, as this board is designed in the US. The - European standard may fit, but the installation may be off by ~1.3mm; it - will slightly stick out. An European variant will be created soon. - - US standard - board edge to nearest pin line: ~8.08mm - board edge to mounting hole: ~9.50mm - - European standard - board edge to nearest pin line: ~9.40mm - board edge to mounting pin: ~11.80mm - -[2] You can also use the HC variant, but HCT is recommended. You're also better - off socketing this IC! - -[3] 2N3904 NPN transistor is from the original alec @ sensi.org schematic. It - is US-centric, however. The onetransistor.eu schematic uses the BC548 due - to the schematic's European origin. To install the BC548 NPN transistor, it - must be installed backward in comparison to its 2N3904 cousin. - - However, the other European BC547 is exactly pin-to-pin compatible to the - 2N3904, so backwards installation is not necessary. - - 2N3904, 2N2222, BC547 = EBC - BC548, BC337 = CBE - -[4] LED brightness. The higher value the resistor is, the lower the LED's - brightness is. Notice R20 is separate from these resistors. Do NOT change - this particular resistor unless you know what you are doing, as it affects - the set voltage from 3V3!