Nice-to-knows about hardware

Example 1
Sensors at the similar input:

The Nebenprozessor LU57813 contains three similar to digital data conversion equipment. Two of it are used for the monitoring of supply voltages of the computer and the plotter, third are freely available for the user. For the link a simple Stereoklinkenstecker is used.
In principle each sensor can (for light, warmth, humidity etc..) it is attached, must be only ensured that the voltage resting against the analogue input moves within the range of O to 2.5 V.
The following simple circuit shows, how an photo-sensitive resistance (LDR) could be adapted
As transistor each universal type, e.g. BC 238, can be used. With the potentiometer sensitivity can be stopped. Before one anschlieAt the PC-1600, one should make sure that the maximum of the output voltage actually is with 2,5 V. In addition the LDR with a short wire is short circuit and measured with the voltmeter the output. Easily modified the circuit can also for other variable of resistances e.g. hot and PTC resistors is used.

Example 2
LED display installation in the CE-1600p over Akkuzustand:

Now no problem. Power supply unit EA-160 and already can it continue (and gleichzetig to become loaded thereby the Akkus also again -Oder attach nevertheless a problem because even no power supply unit thereby? Now in order to avoid this, there are two possibilities: Load before use of the 1600 of system the Akkus Qrdnungsgemaess or by means of software the charge check. But hand on heart, who makes that already? This would do the Akkus anyhow well and it you with a long life span would thank. Often does one go however a simpler way (like I also) and does hang the CE-1600p, whenever possible, to the network and removes it then if necessary again and enjoys then a l00%igen of charge l00%ig? No, because the Akkus does not take part in these excessive loading times in the long term. And if still some over-dischargings are then added, then the life span shortens substantially. Fortunately there is commercial Mignon Akkus with solder points (16-24 DM for 5 St.) for which one would have to pay with Sharp a multiple for it. In order not to make now however again the same errors, and an exact battery voltage monitoring which can be served simply must ago. A Digitalmulltimeter would be a possibility, which supplies a direct and exact voltage indication. However one needs for it a further device with seperater voltage supply. A digital voltmeter panel would be applicably, necessary in addition, a September-guessed/advised voltage supply. Additionally these solutions might not be economical even. A turning reeling instrument necessarily no September-guessed/advised voltage supply, is however not qenau enough readable. A battery voltage indicator represents however a economical solution, which builds likewise very small and no September-guessed/advised voltage supply beoetigt. But it displays unfortunately only the statuses to PROPERTY and BAD and already makes the BATT symbol in the PC-1600.

I discovered now a circuit, those relatively inexpensive, small, to adjust easily exactly and easily to serve am: -- a 10-fach-LED-Band-Spannungs-Anzeige (volt magnifying glass) -- for the normal range from 5.6 to 6,8 V.

One gets the described components in well sorted electronics specialist shops (Voelkner, Conrad etc..) at the price of insges. 25 to 30 DM. I accommodated the circuit on a hole circuit board of the quantity 70*25 mm and used thus the advantage to build these into the housing of the CE-1600p. You see a schematic arrangement on following sketches. After and sinks the recesses for the LED tape display inserted tracer became carefully sophisticated, I stuck sawed off circuit board spacer pieces with internal thread in the area both fastening spots under the top side of the housing (zweikomponentenkleber). Hieran could be screwed then the circuit board Sockelt one the IC and the LED tape display, then one has sufficient height available for the tracer. The tracer (if possible a small microswitch) should be sunk installed, so that when pushing the case to this is not operated and thus the display is switched on. They can use a small pin for switching on on. The structure of the circuit you infer from the connection diagram.

This method folds completely well, has however a hook: Because with Plotterbetrleb the system is switched off with approx. 6,2V.
Note: Fully loaded Akkus has 5 * 1.45 V d.c. 7.25 V
The rated voltage amounts to 5 * 1.24 V d.c. 6.20 V
Normal Entladg. on approximately 5 * 0. 9 V d.c. 4.5 V possible.
One notices Hieran that the plotter operation with Akkus is meaningfully possible hardly. A half to a page max.. The destruction of the Akkus is thus on sucked. To lead back MEMORY effect as well as possible continuous charge. Here Sharp could have offered something better to the users (particularly the power supply unit also not even cheap is). Perhaps there is however still another way out. I up-sketched an idea in the following but for lack of time yet to try out not to be able. Thus CAUTION WITH the NACHEN
Those above, described circuit essentially consists of 2 record to 4 Akkus each (at the best baby)! a switch 2*um, a voltage regulation as well as a flywheeling diode in load direction.
The switch switches the 2 * 4 Akkus either parallel (as represented) for loading and in series for the CE-1600P-Akkubetrieb.
Charging circuit = 2 * 4 Akkus = ~1200 mAh / 4*1.24 V
Betriebsschaltg. = 1 * 8 Akkus = 1200 mAh / 8*1,24 V
With the load operation the Akkus is loaded due to the higher network adapter voltage potential ca.8.4V to ca.5V) over the diode D. Load duration might amount to however min. 24 h.
With the unloading operation, to the Spannungsversorgunq of the CE-1600Ps the Akkuspannung is thus shifted up to 2*5V, stabilized over the positive voltage regulator to 6 V and adapted by means of the resistances g 1, r2 to ca.6.47 V. The voltage regulator operates in the so-called floating operation.

The output voltage calculates itself as follows:
Ua = Ux * (1 + R2/r1) + Iq * R2 Ux=Ausganqsspannung of the ICs = 6V
Iq=Ruhestrom of the ICs = 10 mA
qewaehlte resistances R1=470 kOhm
R2=47 ohm
Ua = 6.47 V