Member N9WXU Posted May 11, 2020 Member Share Posted May 11, 2020 I just received a care package from my father with a pile of old "junk". In there was a Speak and Spell from around 1978, I don't know when mine was bought. I quickly checked the battery compartment (4 C-cells) fearing to find a pile of corrosion. I did, but it was the rusty sort. The battery contacts were rusted. I opened the unit, removed the contacts and dropped them in vinegar to dissolve the rust. The contacts completely fell apart. A quick Amazon order for Keystone 209's and I was back in business. The new clips seem to be slightly thicker or perhaps stiffer, as the batteries are more difficult to insert. BUT it works! While I was waiting for the 209's to arrive, I considered adding an 18650 battery and a USB battery charger. The old TMS5100 series electronics runs from -15v so there is an inverting boost regulator to drop the 6v down to the -15. I tested and this works OK from 5v which is the standard output from the variety of battery manager/chargers you can find. But in the end I did not want a second button to activate the USB battery and then the normal ON button to activate the device. In any case, my 5 year old son loves it, though he did ask "can we install more games". 2 Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.