Talking counter
About the Talking counter PCB
Talking counter is an open source PCB design by swharden, published on GitHub under the MIT license. It is a 2-layer board measuring 86.4 × 61 mm, with 54 components from 26 distinct parts.
Other key parts include the TLV3501AIDR, LM4862MX/NOPB, FT231XS, AP2112K-3.3 and AVR64DD32. By type, the board carries 17 resistors, 15 capacitors, 7 diodes, 6 ICs, 3 connectors and 2 inductors.
It belongs with the audio, usb & debug tools and test & measurement designs in this gallery.
From the project
Open-source USB frequency counter
This folder contains design notes for a talking frequency counter designed to help visually impaired radio operators to know what frequency they are transmitting on by speaking the frequency out loud when a button is pressed. This design uses a high-speed analog comparator to amplify signals on the frontend, measures them directly with a microcontroller, sends that data to a PC using a USB serial adapter, and also says the frequency out loud using a speaker.
Main components on the Talking counter
Talking counter bill of materials (BOM)
54 components, 26 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | TLV3501AIDR | SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | IC1 |
| 1 | LM4862MX/NOPB LM4862MX_NOPB | SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | IC2 |
| 1 | FT231XS | SSOP-20_3.9x8.7mm_P0.635mm | U1 |
| 1 | AP2112K-3.3 | SOT-23-5 | U2 |
| 1 | AVR64DD32 | TQFP-32_7x7mm_P0.8mm | U3 |
| 1 | FT5HV | Oscillator_SMD_Fox_FT5H_5.0x3.2mm | U4 |
| 1 | Conn_Coaxial | SMA_Amphenol_132134_Vertical | J1 |
| 1 | PROG | PinHeader_1x03_P2.54mm_Vertical | J2 |
| 1 | UJ2-MIBH-G-SMT-TR | USB_Micro-B_Amphenol_10118193-0001LF_Horizontal | J3 |
| 1 | Speaker | speaker SM231508 | LS1 |
| 1 | R_VOL | Potentiometer_Alpha_RD901F-40-00D_Single_Vertical | RV1 |
| 1 | 50 | R_Axial_DIN0411_L9.9mm_D3.6mm_P20.32mm_Horizontal | R_LOAD1 |
| 1 | SW_MEC_5E | SW_PUSH_6mm_H5mm | SW1 |
| 2 | D | D_SOD-123 | D1, D2 |
| 1 | LED_PWR | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D3 |
| 1 | RX_LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D4 |
| 1 | TX_LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D5 |
| 1 | LED_STATUS | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D6 |
| 1 | LED_SIG | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D7 |
| 2 | Ferrite | L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1, FB2 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 13 | .1u | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6, C7, C10 +5 |
| 2 | 47p | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C8, C9 |
| 1 | 100k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | 1k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R2 |
| 13 | 10k | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R4, R5, R6, R7, R8, R11, R12 +5 |
| 2 | 27 | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R10 |
Talking counter design files
The KiCad project lives in the swharden/USB-Counter repository on GitHub; these links point at the commit this page was built from.
Talking counter: common questions
How big is the Talking counter PCB?
The Talking counter measures 86.4 × 61 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Talking counter?
54 components, from 26 distinct parts. The full bill of materials is listed on this page.
Where can I download the Talking counter design files?
From the swharden/USB-Counter repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Talking counter design in my own project?
Yes, under the terms of its MIT license, which swharden chose for the repository.
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