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New uses for Spectrum 48K - Light Switch ProjectHi All I'd like to use a Spectrum 48K unit as a light switch in my house. It will reside on the wall in my entrance hall and will be used to contr…
... voltage circuit that then triggers a relay to turn the power on ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
... flows - not like a short circuit. But enough for the chips ... in the circuit to detect the drop in ... it and you can power any sort of circuit you like. But ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
... flows - not like a short circuit. But enough for the chips ... in the circuit to detect the drop in ... it and you can power any sort of circuit you like. But ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
Remember, to an electronic circuit, a normal digital Atari compatible ... two types of auto-fire circuit. Both need the common to ... the cable. The other steals power from the electronics via the ... to operate the auto-fire circuit. If this resistor is not ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
... types of auto-fire circuit. Both need the common ... cable. The other steals power from the electronics via ... operate the auto-fire circuit. If this resistor is ... is the auto-fire circuit which fire1 and fire2 ... the circuit to work if the signal carried power allowing ... -
ComCon interface with an auto-fire joystick is possible?I need a little advice on this one, please! I have a konix speedking, with two fire buttons and auto-fire switch. I can use it with the comcon int…
... enough to drive the autofire circuit..? Just an idea, I'm ... that you drain loads of power when you press the fire ... - or even short out the power altogether. -
Making your own tapesTowards the end of last year [url=https://www.worldofspectrum.org/forums/discussion/53607/recommend-modern-1994-2017-games]I dropped in here to ask a…
... muck and fluff from the circuit boards, and all the drive ... sounds better with the Dolby circuit off, though - the deck only ... Spectrum tapes because the Dolby circuit will need to be off ... , and [i]all[/i] the Power-Load games were trashed this ... -
Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…
It might also be worth removing TR1-TR3 as they could all be damaged.. however if you leave L3 and L4 out of circuit, this does remove power from the damaged circuitry. It's possible this is what whoever was originally trying to repair the +2B was doing. -
Repair Zx Spectrum +2 Blackhello there, just found a Zx Spectrum +2 Black edition Issue 1 board that doesnt appear anything on the screen, even led dont power on,i have tes…
... at this point if your power LED is not lighting. They ... in this circuit.
If you are sure the power supply ... to the points in the circuit that they should be. It ... -
Running a Spectrum from a battery...?Here's a bizarre idea that crossed my mind the other day: is it possible to run a Spectrum from a 12V battery? You see, I've got this strange idea…
... Spectrums that have had the power supply upgrade modification (issue 3B ... known to had the "mandatory" power supply upgrade modification, it's ... not wise to power these with any input voltage ... . So a 5V switching regulator circuit would be needed to supply ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... SRAM chips. But when the power is disconnected, SRAM chips forget ... the charging part of the circuit is disabled, and a suitable ... to work out how the circuit works. Then develop new program ... -
Kempston interface schematic: wrong IC?Hi! I'm trying to learn about the inner workings of the speccy, and I thought that building a kemspton interface would help me learn about things lik…
... two types of auto-fire circuit design. One needs a +5V ... 7). The other type "steals" power from the pull-up resistor ... -
Help understanding the Z80.So I have a Z80 CPU and a 32k ram chip. I understand how they connect. (Data and address busses, chip select etc.) But how would i input information…
... can be done in-circuit by a running program ... separate device or in-circuit. Instead of wiping out ... spurious writes at power up or power down (see next ... happens at power up or power down. On power down as ... computer to allow in-circuit programming but this is ... -
SD Card Interfaces for the ZX Spectrum : the complete list OK I admit it : this thread will start life as the incomplete list of SD card interfaces but the aim is to list the lot
... : These points are mentioned : "overhauled circuit design" , "a pleasure to own ... only a half of the power of other Div MMCs" ,"will ... saying it runs on low power and is very compatible .with ... -
+2 grey - datacorder on/off switch?Hi everyone. Building a simple on/off switch to power up/down the tape deck will eliminate the noise in sound output? Is this a safe approach or …
... the power. If I click again and restore +5V to deck circuit ... line going to tape deck circuit (just before the switch, say ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... /> Due to the internal switching power supply that generates the -5V ... the capacitors used in this circuit is important, as failure of ... video if the internal switching power supply dies.
So ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... you can get a Chinese power supply with one of these ... with though my understanding of circuit diagrams and technical drawings needs ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... ? The MuRata one offers short circuit protection , over current protection , and ... ="http://uk.farnell.com/recom-power/r-78b5-0-1-5 ... /1793163"]uk.farnell.com/recom-power/r-78b5-0-1-5 ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... , that's a power transistor (often a power MOSFET) that switches ... higher. For same amount of power, high voltage = low current. ... switch whether more or less power is needed.
... connect package thermally with the circuit board. That would be ... -
Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…
... board that has the +2B circuit (as most of them do ... line, plus until my atx power supply turns up I can ... -
Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…
... that because it exposes the power supply if you forget about ... /wiki/Voltage_divider"]voltage divider[/url] circuit. R44 is in series with ... -
Spectrum 128k 2a or not 2b....Just picked up a +2 black case version and I'm in as little bit of a quagmire, The case is definitely black, has '+2A' stamped on the bottom, but in…
... and new belt, Atx power supply converted to power it, factory mod ... has been moved to under circuit board ... -
Send in the ClonesPlease name all the Spectrum clones out there ( I would say I need it back on my desk in 5 minutes , but I will be a bit more generous in this case!…
... Vasil'evič Starostenko of the circuit board.
The development ... two hours to study the circuit. Based on the information received ... was also kept the same power consumption.
The first ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... -09 volts and an open circuit with the neg probe in ... need to refer to a circuit diagram .
Diode function ... (which is next to the power plug) on 3 different PCBs ... -
Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... like a Recom or Traco Power) in place of the 7805 ... the DC/DC converter/inverter circuit (for the +12V and - ... /off switch in it's power lead.
[*]Have at ... least one "power on" LED. Maybe one LED ... for each of the four power rails if space can ... -
ZX Spectrum Test PCB I recently read about one of these (I think it may have been the Retroleum site but I am not sure) and I thought "What a great idea" . As pictured …
... like a Recom or Traco Power) in place of the 7805 ... the DC/DC converter/inverter circuit (for the +12V and - ... /off switch in it's power lead.
[*]Have at ... least one "power on" LED. Maybe one LED ... for each of the four power rails if space can ... -
Clamping Speccy InterfacesThere are a huge number of broken Speccy interfaces available . I came across one on Ebay recently said to be "partly working" or similar .Why are th…
... resistor that dissipates the wasted power as heat. Which is why ... very quickly, based on the power being drawn from it. So ... 's a way more complicated circuit, which is why it costs ... -
ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... have failed, especially in the power supply circuit, you wouldn't get ... -
ZX Spectrum 48K it only shows colored barsHello, I'm new to the forum and I need help with a ZX Spectrum 48K which I bought recently unfortunately defective. I want to mention that before t…
... speaker is okay, when you power on, after a few seconds ... the Spectrum disconnected from the power, it may be worthwhile testing ... on the schematic for that circuit for that pin.
Good MAME gamesJust as everyone has a list of must-play spectrum games, which arcade games are worth playing either because they are still good, or are just a big n…
... /> Batsugun
Battlantis
Battle Circuit
Ben Beroh Beh
Power Instinct Matrimelee
Mega Twins ...
