Car entertainment systems have been around since at least 1930, when a brand new company called Motorola designed one of the first successful AM radio systems for an automobile. 87 years later, even base-model cars are on the dealer’s lot with streaming stations right in the console, USB ports for connecting music players and Bluetooth chips for wirelessly linking smartphones.

Tech companies are also getting their software directly into the dashboard to integrate smartphones and cloud services. Platforms include Google’s Android Auto, Apple’s CarPlay and Microsoft Connected Vehicle.  And Amazon’s Alexa assistant will be showing up soon in some Ford and Volkswagen models.

As they did with 8-track and cassette tape decks, though, carmakers are slowly phasing out compact disc players as installed features in favor of digital audio files and streaming connections. But if you have CDs you want to play — say, educational lectures you don’t feel like ripping to MP3 — and your car dealer has no aftermarket solutions to suggest, it is possible to hack together a system for $50 or less.

Most dashboard entertainment systems still have an auxiliary audio port available; check your car’s manual for the location on the dashboard if you don’t see the port. In most cases, you can use this port and a 3.5-millimeter auxiliary audio cable to connect the headphone jack on an inexpensive battery-powered portable CD player. Set the audio input on the dashboard to AUX and push the play button on the CD player.

Check your car’s manual (yes, it has one) to find out about the types of audio devices you can connect to your dashboard entertainment system. If you do not have an old portable CD player on hand, you can still find options at stores like Amazon, Best Buy and Target. Prices generally start around $20, but get a shock-resistant player because American infrastructure has seen better days.

An auxiliary audio cable costs $5 and up. If you don’t want to keep feeding the player batteries, an electrical adapter for the car’s 12-volt power port takes care of the juice.

Most new cars support Bluetooth wireless connections, so if you hate cables, swap in a Bluetooth adapter with its own 3.5-millimeter plug that connects to the CD player. Once you pair the adapter to the car’s Bluetooth system, you can stream the audio from the CD player to the sound system. Taotronics and Mpow are among the companies that make Bluetooth adapters for less than $35 and there are plenty more online.

No matter what you’re using to boom your tunes in the cabin, though, drive safely.