N5BRG/H_Control_and_PowerPower and Control design for Radio Astronomy Preamp
H Control and Power is an open-source printed circuit board by N5BRG, from the N5BRG/H_Control_and_Power repository on GitHub. It is a 2-layer board of 22.1 × 82.3 mm with 46 parts on 23 nets, routed with 181 tracks and 53 vias.
It is built around the MAX4475ASA+T, ADPL44001AZT+T and TLV7031DBV, with the BC857, FDN302P and RM699BV-3011-85-1005 among its other parts. Its parts include 16 resistors, 9 capacitors, 3 ICs, 2 diodes and 2 transistors.
Copyright (c) 2026 Robert S. Stricklin Jr
This hardware design is licensed under the CERN Open Hardware Licence Version 2 - Permissive (CERN-OHL-P-2.0).
You may obtain a copy of the license in the LICENSE file included with this repository.
This design is a control and low-noise power supply for a Radio Astronomy Preamplifier. The board expects an input voltage of either 6.0 volts or 6.5 volts.
When the input voltage is 6.0 volts, the control voltage on pin 5 of J12 will be LOW, or approximately 0 volts. When the input voltage is 6.5 volts, the voltage on this pin will be approximately 1.8 volts. These voltage levels are used to control a PIN diode switch on the RF preamplifier board included in another repository maintained by N5BRG.
| Input Voltage | J12 Pin 5 Output | PIN Diode Switch State |
|---|---|---|
| 6.0 V | Approximately 0 V | OFF |
| 6.5 V | Approximately 1.8 V | ON |
The goal of this design is to provide the control voltage required for the PIN diode switch while also supplying a well-regulated, low-noise 5-volt power source for the preamplifier.
An optional relay circuit is included on the board. When populated, this relay may be used to switch other preamplifiers that support external control or switching functions.
There are two ground connections on the control board. One supports the low-noise 5-volt power supply, while the second is intended for the digital control voltage associated with the PIN diode switch. Separating these grounds helps minimize the possibility of digital switching noise coupling into the RF signal path.
The PCB is designed to plug directly into a compatible preamplifier PCB. However, because the control board is longer than the preamplifier board, it may be more practical to mount the boards side-by-side in some installations.
KiCad Version 10 was used to create the files in this repository.
This design was created to support the educational and scientific goals of the Society of Amateur Radio Astronomers (SARA). Additional information about SARA can be found at:
https://www.radio-astronomy.org/
Many of the ideas incorporated into this design were discussed during SARA's regular monthly Zoom meetings and educational activities.
If you enjoy physics, astronomy, radio astronomy, electronics, and scientific experimentation, please consider joining SARA (https://www.radio-astronomy.org) and participating in their programs. SARA is an especially good opportunity for students and young people who are interested in science, engineering, and technology. Most participation is conducted online through video conference meetings.
If you use KiCad, please consider making a donation to the project to help support the continuing development and distribution of this outstanding open-source electronic design software.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C11, C12, C14, C15, C21 |
| 4 | MountingHole_Pad | MountingHole:MountingHole_2.2mm_M2_DIN965_Pad | H12, H13, H14, H15 |
| 3 | 47K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R15, R16, R20 |
| 3 | TestPoint_2Pole | TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill1.0mm | TP10, TP11, TP12 |
| 2 | 10K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R14, R28 |
| 2 | 2.4K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R21, R23 |
| 1 | +5VDC | TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill0.7mm | TP14 |
| 1 | .1u | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C20 |
| 1 | 0 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R18 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R25 |
| 1 | 10 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R22 |
| 1 | 100K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R26 |
| 1 | 100u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C16 |
| 1 | 10n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10 |
| 1 | 1N4003 | Diode_SMD:D_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D12 |
| 1 | 267K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R12 |
| 1 | 3.3 Meg | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R17 |
| 1 | 30K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R27 |
| 1 | 4.640K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R24 |
| 1 | 4.7u | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C13 |
| 1 | 59K | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R13 |
| 1 | ADPL44001AZT+T | Package_TO_SOT_SMD:TSOT-23-6 | U10 |
| 1 | BC857 | Package_TO_SOT_SMD:SOT-23 | Q2 |
| 1 | BZX84Cxx | Package_TO_SOT_SMD:SOT-23 | D11 |
| 1 | Conn_01x04_Pin | Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical | J12 |
| 1 | Control | TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill0.7mm | TP13 |
| 1 | FDN302P | Bob:FDN302P SSOT-3 | Q10 |
| 1 | MAX4475ASA_ | Bob:SOIC127P600X175-8N | U11 |
| 1 | RM699BV-3011-85-1005 | Relay_THT:Relay_SPDT_Fujitsu_FTR-LYCA005x_FormC_Vertical | K10 |
| 1 | R_Com | Bob:TestPoint_Bridge_Pitch2.54mm_Drill1.0mm | R_Com1 |
| 1 | R_NC | Bob:TestPoint_Bridge_Pitch2.54mm_Drill1.0mm | R_NC1 |
| 1 | R_NO | Bob:TestPoint_Bridge_Pitch2.54mm_Drill1.0mm | R_NO1 |
| 1 | TLV7031DBV | Package_TO_SOT_SMD:SOT-23-5 | U1 |
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It measures 22.1 × 82.3 mm and has 2 copper layers, 1.6 mm thick.
46 parts, built around the MAX4475ASA+T, ADPL44001AZT+T, TLV7031DBV and BC857. 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.
From the N5BRG/H_Control_and_Power repository on GitHub, at the commit this page was made from: the board is H_Control and Power.kicad_pcb and its schematic H_Control and Power.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask N5BRG before reusing the design.