2 layers177.8 × 114.3 mm
Psu
eshazen/scope-clock
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
66 parts
2 layers177.8 × 114.3 mm
B 250 test
eshazen/scope-clockIt seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
- Size
- 177.8 × 114.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 49
- Nets
- 41
- Pads
- 144
- Tracks, vias
- 201, 4
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 9 Dec 2022
- Updated
- 28 Feb 2024
Overview
B 250 test is an open-source printed circuit board by eshazen, from the eshazen/scope-clock repository on GitHub. It is a 2-layer board of 177.8 × 114.3 mm with 49 parts on 41 nets, routed with 201 tracks and 4 vias.
It is built around the ATTINY84A-PU. Its parts include 15 resistors, 13 capacitors, 6 connectors, 3 ICs and 2 diodes. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
1README
hardware/psu/README.mdPower Supply
Status
2023-02-23 Mostly working. Relay wiring incorrect (see ECOs). Otherwise all outputs verified working, at least with no load.
Rev A ECOs
- C13 should be much bigger, maybe 4700uF
- Bridge footprints are wrong (holes way too small)
- Relay wiring is incorrect
- Can't use the S4 or S6 outputs of the CW multipler, only S5, S7. Maybe add an S3 tap? In any case, fix J14 wiring.
Requirements
- AC power entry, fuse, power switch
- +8V for logic (~1A) regulator on CPU board makes 5V for DAC (Antek 6.3V winding too wimpy)
- -5V for Z axis drive (low current). Should be regulated
- 8-stage CW generator for -1500V
- Jumpers to select output voltage
- Discharge circuit for power-down
- Voltage doubler for +360V with two-stage R-C filter (200 ohm, 100uF or so)
- Switched AC out (2x?) for 12V filament transfomer plus spare
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
ECOs for Rev 1
- Relay wiring wrong. Cut traces to J1 pins 1,3. Wire pin 1 to Relay pin 11 and pin 3 to relay pin 12. (leave gap in cut, ~180VAC)
- Add bleeder on 360V! (ouch!)
Parts
49| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100u 400V | Capacitor_THT:CP_Radial_D22.0mm_P10.00mm_SnapIn | C1, C2, C3, C4 |
| 4 | MountingHole | MountingHole:MountingHole_4.3mm_M4 | H1, H2, H3, H4 |
| 3 | 0.1uF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C5, C11, C12 |
| 2 | 0.22uF 400V | Capacitor_THT:C_Rect_L16.5mm_W6.0mm_P15.00mm_MKT | C8, C10 |
| 2 | 1N4007 | Diode_THT:D_DO-41_SOD81_P10.16mm_Horizontal | D1, D2 |
| 2 | 200 ohm 5W | Resistor_THT:R_Axial_DIN0617_L17.0mm_D6.0mm_P25.40mm_Horizontal | R2, R3 |
| 2 | Conn_01x02 | Connector_TE-Connectivity:TE_826576-2_1x02_P3.96mm_Vertical | J1, J6 |
| 2 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2, J3 |
| 1 | 1 | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R5 |
| 1 | 100k_audio | Potentiometer_THT:Potentiometer_Bourns_3266Y_Vertical | RV1 |
| 1 | 100uF 16V | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C6 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R14 |
| 1 | 10uF 450V | Capacitor_THT:CP_Radial_D10.0mm_P5.00mm | C7 |
| 1 | 120 ohm 5W | Resistor_THT:R_Axial_DIN0617_L17.0mm_D6.0mm_P25.40mm_Horizontal | R1 |
| 1 | 120K | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P15.24mm_Horizontal | R9 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R6 |
| 1 | 2.2K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R8 |
| 1 | 2.2uF | Capacitor_THT:C_Disc_D3.4mm_W2.1mm_P2.50mm | C13 |
| 1 | 270 1W | Resistor_THT:R_Axial_DIN0411_L9.9mm_D3.6mm_P15.24mm_Horizontal | R7 |
| 1 | 270k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R13 |
| 1 | 330 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R15 |
| 1 | 330pF 100V | Capacitor_THT:C_Rect_L7.2mm_W4.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C9 |
| 1 | 33K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12 |
| 1 | 470K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R11 |
| 1 | 47k | Resistor_THT:R_Axial_DIN0309_L9.0mm_D3.2mm_P12.70mm_Horizontal | R10 |
| 1 | 47k 2W | Resistor_THT:R_Axial_DIN0414_L11.9mm_D4.5mm_P20.32mm_Horizontal | R4 |
| 1 | 6T9 | my_tubes:Compactron_PCB | U1 |
| 1 | AES_PT-31 | my_trans:MPS-OT8SE | T1 |
| 1 | ATtiny84A-P | Package_DIP:DIP-14_W7.62mm | U3 |
| 1 | AVR-ISP-6 | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J4 |
| 1 | CXO_DIP8 | Oscillator:Oscillator_DIP-8 | X1 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | JP2 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | SN76489 | Package_DIP:DIP-16_W7.62mm_LongPads | U2 |
| 1 | SW_SPST | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | SW1 |
| 1 | Speaker | Connector_TE-Connectivity:TE_826576-2_1x02_P3.96mm_Vertical | LS1 |
More from eshazen/scope-clock
5- 4 layers116.8 × 111.8 mm
Dac
eshazen/scope-clock
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
60 parts - 2 layers177.8 × 101.6 mm
Deflection amp
eshazen/scope-clock
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
44 parts - 2 layers177.8 × 114.3 mm
Sound
eshazen/scope-clock
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
43 parts - 2 layers121.9 × 85.1 mm
Anderson crt
eshazen/scope-clock
It seems I have a bunch of surplus 12V transformers in my office, so probably will use two of those to generate the +8V and -5V with bridge rectifiers.
26 parts
Similar boards
- 2 layers57 × 57 mm
Quiet orbit qo r1-usb c four light ambient lamp board
copperheadhq/copperhead-quiet-orbit
USB-C four-light ambient lamp, 57 mm, ATtiny84A hardware PWM. Designed with copperhead. Never built: do not order expecting it to work.
27 parts3 - 2 layers96.5 × 25.4 mm
- 2 layers94 × 63.8 mm
TinySensorv1
arcadien/tinySensor
Firmware and generic board for low-power environment sensors
45 parts2MIT - 2 layers55.2 × 40.6 mm
- 2 layers35 × 28 mm
Volvo240pcb
pddenhar/Volvo_240_Info_Display
OLED dashboard module for the Volvo 240 displaying battery voltage, speed, and RPM.
18 parts2 - 2 layers90 × 40 mm
Plate
BryceVandegrift/hot-plate
A DIY PCB hot plate that uses through hole components
30 parts1CERN-OHL-W-2.0 - 2 layers92 × 45 mm
L6 - P2
AhmedAtefNasr/PCB_Course-IMT_school
Here's the repo for Assignments & projects of PCB course from IMT school
49 parts - 2 layers46 × 66 mm
Door sensor schaltplan
Brawn1/ATTiny-Door-Sensor
Door Sensor Battery based with Attiny84 and HC-12 Sender
19 parts
Questions
How big is the B 250 test PCB?
It measures 177.8 × 114.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the B 250 test use?
49 parts, built around the ATTINY84A-PU. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the B 250 test KiCad files?
From the eshazen/scope-clock repository on GitHub, at the commit this page was made from: the board is hardware/b_250_test/b_250_test.kicad_pcb and its schematic hardware/anderson_crt/anderson_crt.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the B 250 test design in my own project?
Its repository states no licence, so its author keeps all rights: ask eshazen before reusing the design.