> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # Pololu 4-Channel RC Servo Multiplexer (Partial Kit) **Type:** Product page · **SKU:** POLOLU-2807 · **Brand:** [Pololu](https://core-electronics.com.au/brands/pololu-australia) **Page:** https://core-electronics.com.au/pololu-4-channel-rc-servo-multiplexer-partial-kit.html ([markdown](https://core-electronics.com.au/pololu-4-channel-rc-servo-multiplexer-partial-kit.html.md)) This compact four-channel multiplexer of hobby radio control pulses allows for easy switching between two independent signal sources. An auxiliary channel selects whether the output comes from the master or the slave source. The activation threshold and direction are configurable. Surface-mount components are pre-assembled on the PCB, but through-hole components are not installed and require soldering. ## Pricing - **Price:** $25.10 (inc GST) — $22.82 AUD, exc GST - **Quantity discounts:** 10+ $21.91 (exc GST) · 25+ $21.22 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 17 and Aug 18. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=POLOLU-2807:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/POLOLU-2807:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description | [![](https://core-electronics.com.au/attachments/localcontent/0J4845_2145389cb57.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4845_19216160a68.jpg) | |---| The Pololu 4-Channel RC Servo Multiplexer can be used with standard hobby radio control systems and [servo controllers](https://core-electronics.com.au/breakout-boards-and-modules/motor-drivers-controllers/servo-controllers.html) to allow easy switching of servo control between two independent sources using a separate auxiliary channel as the input selector. This makes it ideal for applications in which you have two possible control sources and want to be able to switch between them on the fly. For example, you could connect two RC receivers to the same set of servos or electronic speed controls (ESCs) and allow the master transmitter to decide whether the master or slave transmitter is in control, thereby setting up your own buddy-system training setup. Another possible application would involve multiplexing between an RC receiver and a servo controller, which would allow you to switch between autonomous and manual control of a set of servos. The RC multiplexer (also known as a “mux”) is available [preassembled with male header pins](https://core-electronics.com.au/pololu-4-channel-rc-servo-multiplexer-assembled.html) or as a [partial kit](https://core-electronics.com.au/pololu-4-channel-rc-servo-multiplexer-partial-kit.html) that allows for greater application flexibility and more compact installations. | [![](https://core-electronics.com.au/attachments/localcontent/0J4846_39557dee767.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4846_332827c5017.jpg) | |---| The RC multiplexer measures the width of incoming RC pulses on the channel labeled **SEL** and compares it to a user-configurable threshold (with ±64 µs of hysteresis) to decide whether the master (M1–M4) or slave (S1–S4) inputs to the mux should show up on the output channels (OUT1–OUT4). By default, the threshold is approximately 1700 µs and the slave inputs are only selected when the pulses on SEL are above this threshold. The multiplexer has a learning mode that allows you to change the threshold and activation direction. A yellow indicator LED provides feedback about the state of the RC mux. When the RC signal on the SEL channel is lost or invalid, the optional **FAILMODE** jumper determines the output behavior. If the jumper is left off, the master inputs will be in control. If the jumper is connected, the output channels go low and stay low for as long as the signal on the SEL channel remains invalid. For many servos and ESCs, a constant low on the signal line will turn them off, which might be desirable if the control signals are known to be bad. The multiplexer considers the RC signal on the SEL channel to be valid if it has a 10–330 Hz pulse rate and 0.5–2.5 ms pulse width. The other inputs (S1–S4 and M1–M4) are unrestricted. The power supplied by the master RC device should be between 2.5 and 16 V, and it must be capable of supplying the current that the servos connected to the outputs draw. The power pins of the SEL, M1–M4, and OUT1–OUT4 channels are all connected to the same **VM** rail, and the mux draws its power from those pins. The power pins of the S1–S4 inputs are connected to each other on the **VS** rail but are not used by the board. More information about using this product can be found in the user’s guide. This product replaces items [\#721](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-721) and [\#722](https://core-electronics.com.au/catalog/product/view/sku/POLOLU-722). **Included hardware** The Pololu 4-Channel RC Servo Multiplexer is available in two versions: - The [assembled version](https://core-electronics.com.au/pololu-4-channel-rc-servo-multiplexer-assembled.html) ships with the headers pins soldered in to every through-hole except the extra slave power connection pins, as shown in the left picture below. A shorting block is included for optional use with the FAILMODE jumper pins. The assembled version can be incorporated into an existing RC system without the need for any additional soldering. The header pin spacing is the same as on standard RC receivers, so the board works directly with standard hobby RC [servos](https://core-electronics.com.au/category/23/rc-servos) and [servo cables](https://core-electronics.com.au/category/112/servo-cables). - The [partial kit version](https://core-electronics.com.au/pololu-4-channel-rc-servo-multiplexer-partial-kit.html) gives you the flexibility to choose different connections. It includes a shorting block and two 1×25-pin male headers. These strips can be broken into smaller strips and soldered to the board, or wires can be soldered directly to the board for the most compact installation. | \| [![](https://core-electronics.com.au/attachments/localcontent/0J4841_148366252fc.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4841_27347c57d1e.jpg) \| \|---\| \| Pololu 4-Channel RC Multiplexer (Assembled). \| | \| [![](https://core-electronics.com.au/attachments/localcontent/0J4844_19299d16689.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4844_248107ec811.jpg) \| \|---\|---\| \| Pololu 4-Channel RC Servo Multiplexer (Partial Kit) with included hardware. \| | |---| **Comparison to Pololu's RC switches** The RC multiplexer is essentially Pololu's [Pololu RC Switch with digital output](https://core-electronics.com.au/pololu-rc-switch-with-digital-output.html) combined with a quad 2-input multiplexer. The LED behavior and configuration procedures are the same. However, the RC switches have a safe-start feature that is not enabled on the RC multiplexer. The RC switches have a GOOD output that is high when the signal is good, while the RC multiplexer has a GOOD output that is low when the signal is good (this signal can be accessed via the upper/octagonal pad of the FAILMODE jumper). The RC switches have an OUT output that indicates whether the switch is active; the RC multiplexer has the same signal, but it is not easily accessible. | [![](https://core-electronics.com.au/attachments/localcontent/0J4902_26320b5ee41.jpg)](https://core-electronics.com.au/attachments/localcontent/0J4902_15506ea1fce.jpg) | |---| | The Pololu RC Switch family of products. | **People often buy this product together with:** | [![Pololu RC Switch with Digital Output](https://core-electronics.com.au/attachments/localcontent/0J4848_4838828194.jpg)](https://core-electronics.com.au/pololu-rc-switch-with-digital-output.html) | [Pololu RC Switch with Digital Output](https://core-electronics.com.au/pololu-rc-switch-with-digital-output.html) | |---|---| | [![Pololu RC Switch with Small Low-Side MOSFET](https://core-electronics.com.au/attachments/localcontent/0J4850_503269fd55.jpg)](https://core-electronics.com.au/pololu-rc-switch-with-small-low-side-mosfet.html) | [Pololu RC Switch with Small Low-Side MOSFET](https://core-electronics.com.au/pololu-rc-switch-with-small-low-side-mosfet.html) | |---|---| | [![Pololu RC Switch with Medium Low-Side MOSFET](https://core-electronics.com.au/attachments/localcontent/0J4814_5639f62cff.jpg)](https://core-electronics.com.au/pololu-rc-switch-with-medium-low-side-mosfet.html) | [Pololu RC Switch with Medium Low-Side MOSFET](https://core-electronics.com.au/pololu-rc-switch-with-medium-low-side-mosfet.html) | |---|---| **Dimensions** | Size: | 0.97" × 0.97" | |---|---| | Weight: | 1.6 g[1](https://core-electronics.com.au/#note1) | **General specifications** | Minimum operating voltage: | 2.5 V | |---|---| | Maximum operating voltage: | 16 V | | Partial kit?: | Y | **Identifying markings** | PCB dev codes: | rcm01b | |---|---| | Other PCB markings: | 0J7701 | **Notes:** 1Without included optional headers. **Documentation and other information** - ![](https://core-electronics.com.au/attachments/localcontent/0J4901_4696ae2657.jpg)**Pololu RC Switch User’s Guide (Printable PDF)** User’s manual for the Pololu RC Switch with Medium Low-Side MOSFET and the Pololu RC Switch with Relay. **File downloads** - **Pololu 4-Channel RC Servo Multiplexer schematic diagram (210k pdf)** Printable schematic diagram of the 4-Channel RC Servo Multiplexer schematic diagram. - **Drill guide for the 4-Channel RC Servo Multiplexer (38k dxf)** This DXF drawing shows the locations of all of the board’s holes. ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/p/o/pololu_4_channel_rc_servo_multiplexer__partial_kit___pololu_2807__00.jpg)