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TEKTRONIX 222 & 224 BATTERY ADAPTER FOR LI+ BATTERIES (Bare PCB)
TEKTRONIX 222 & 224 BATTERY ADAPTER FOR LI+ BATTERIES (Bare PCB)

TEKTRONIX 222 & 224 BATTERY ADAPTER FOR LI+ BATTERIES (Bare PCB)

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Part Number:CAS-TEKBATPCB
This is a bare PCB for building your own lithium battery adapter for a Tektronix 222/224 series handheld oscilloscope.  This is the PCB only and you will need to provide all the components and populate the circuit board yourself.  Note that most of the passive components are 0603 size and incredibly small, therefore a microscope is highly recommended, as is a very small soldering tip.  Assembly of this PCB is recommended only for those with excellent soldering skills.  It is recommended to use solder paste and a hotplate (or reflow oven) for all the bottom side components, and only manually solder the top side components.  Returns will only be accepted for PCBs that have not had any assembly attempted.

This is a battery charger/adapter to use common 18650 Lithium Ion batteries in place of the long obsolete sealed lead-acid (SLA) battery that originally shipped with the Tektronix 222 and 224 family of handheld oscilloscopes.  This charger/adapter fits in the original battery compartment of the oscilloscope and manages the charging and power requirements of the oscilloscope.  It features a boost converter to provide the approximately 8V that the scope needs for operation, battery management and protection for each of the the 18650 batteries to prevent overcharging, as well as circuitry to prevent over discharging of the batteries, which may cause irreversible cell damage.

In addition to the component BOM (Bill of Materials) linked below, you will need to provide 18650 batteries (the adapter will support 1, 2 or 3 batteries, not included), as well as the battery wire harness from the original battery.  A female header is provided to solder on to the wire harness so it can be plugged into the board header.

The charger/adapter can be used as is, or you can 3D print an enclosure (designed specifically for this board by NearFarMedia).  The files to 3D print the enclosure can be found here: 

Circuit board design based upon the work of Kitsune-Denshi. licensed under the Creative Commons Attribution-ShareAlike License.  More information on the design and operation, including schematic diagram can be found here:

The BOM for purchasing the required components (except the 18650 lithium batteries) can be found here.  This is a direct link to DigiKey.  It already has the required quantities, so just click the link, add it to your cart and you'll be good to go.  If you're planning to build more than one PCB, you can set the number of assemblies in the top right corner of the page and it will automatically multiply the quantities accordingly.

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