Tag: power cutoff

A compact inline MOSFET protector that disconnects a Commodore 64 supply when the monitored voltage exceeds the safe range.

Shareware Plus and Ami64 each listed the inline OVP64 at GBP 39 in 2026. Protovision listed six units at EUR 48 with a one-to-two-week shipping estimate on 2026-07-30. All three describe the same compact MOSFET design and a 5.40 V safety threshold. The public listings do not specify a response-time measurement, reset procedure, 9 VAC behavior, current rating, fuse, schematic, or designer. An older boxed OVP64 was sold by Shareware Plus, but its electrical relationship to the current inline product is not established.

A compact semiconductor protector for the 5 VDC and 9 VAC rails of compatible Commodore power supplies.

CMD Marketplace listed four units at USD 40 on 2026-07-30. The page claims a 20 microsecond semiconductor response versus 200 milliseconds for a relay design. After a 5 V trip, its 1.25 A SMD fuse must be replaced with a soldering iron; one spare is supposed to be included. The page simultaneously displayed a USD 9 United States rate and a notice that the item does not ship to the United States, so confirm destination availability before ordering.

A historical relay protector with alternate DC and AC inputs for several Commodore power configurations.

The surviving Round 4 sale thread is explicitly titled SOLD and dates to 2017. It offered complete kits at USD 45 and assembled units at USD 85. C64 OS repeated those prices in 2022, but that does not establish later production. The former hookturn.com user-guide URL now resolves to a parked domain. Use the preserved feature and forum specifications for identification, and search the used market rather than contacting the old seller as though stock were current.

A source-available relay board that cuts the C64's 5 V supply above about 5.6 V.

The public repository was last updated in January 2020 and PCBWay retains a bare-board order route for Revision E. No explicit hardware license is published, so this is source-available rather than licensed open hardware. Revisions C and D require a documented bridge between DIN pins 4 and 5 for supplies that place 5 V on the alternate pin; Revision E incorporates that fix. A separate builder found severe thermal drift in an older Console5-derived prototype and called that build unfit for protection. Test any completed board's trip point and stability under realistic load and temperature before relying on it.