STROBE it's the project of a xenon strobe lamp, which I made when I was a boy. The lamp can flash autonomously, at a settable frequency, and moreover it can also be controlled from the PC, a microphone and other lights, through auxiliary modules.
Attenzione! Tutto lo stroboscopio è collegato direttamente alla rete 230 Volt, pertanto è molto pericoloso toccare ogni sua parte (anche i suoi piedini 5 e 6). Sono invece elettricamente isolati i terminali 3 e 4. Per l'alimentazione in sicurezza è infatti consigliabile interporre tra la presa rete e lo stroboscopio un trasformatore di isolamento 220 - 220 Volt.
In addition, the xenon strobe lamp is powered by a voltage of 600Vdc (between its A and K terminals) and the ignition voltage of the same lamp can reach even 4KV!
Xenon strobe lamp wiring diagram
I / O:
- 1, 2 - Power voltage entrance (220-230vac), the components are not isolated, so do not touch them!
- 3,4 - ingresso per comandare l'impulso luminoso (opto isolato, 5-15Vdc)
- 5, 6 - low voltage power output (12vdc, few but)
- S1 - General power switch
- S2 - internal oscillator scale (slow / fast flashes)
- S3 - interruttore per abilitare l'oscillatore (abilitazione lampeggio automatico)
- R11 - Lamp flashing frequency adjustment
Modulo ausiliario 1: innesca un lampeggio della lampada xenon quando viene rilevato un flash di un'altra lampada o un suono.
Auxiliary Module 2: Connect the xenon strobe to the parallel port of the computer, to control flashes.
List of components, resistors:
- R1 - 1 Kohm 17 W (must dissipate heat)
- R2 - 1 Kohm 17 W (DEVE to dissipate the heat)
- R3 - 5600 OHM 5 W (DEVE to dissipate heat)
- R4 - 27 KOHM 1/2 W
- R5 - 1 MOHM 1/2 W
- R6 - 270 KOHM 1/2 W
- R7 - 330 OHM 1/4 W
- R8 - 100 OHM 1/2 W
- R9 - 1 KOHM 1/4 W
- R10 - 680 OHM 1/4 W
- R11 - 10 Kohm Logarithmic potentiometer
- R12 - 1 KOHM 1/4 W
- R13 - 470 OHM 1/4 W
List of components, capacitors:
- C1 - 22 UF 350 V or more, electrolytic
- C2 - 22 UF 350 V or more, electrolytic
- C3 - 22 UF 350 V or more, electrolytic
- C4 - 22 UF 350 V or more, electrolytic
- C1, C2, C3, C4, use capacitors with high discharge power
- C5 - 100 nf 630 in the doors
- C6 - 470 UF 25 V Electrolytic
- C7 - 100 NF Poliestere
- C8 - 10 NF polyester
- C9 - 47 UF 25 V Electrolytic
- C10 - 470 UF 25 V Electrolytic
Other electronic components:
- IC1 - NE.555
- TR1 - BC.237
- SCR1 - THIS.612
- OC1 - 4n.25
- D1 - 1N.4007
- D2 - 1N.4007
- D3 - 1N.4007
- D4 - Diodic at Germanio
- DZ1 - Diode Zener 12 V 1 W
- S1 - switch (power switch)
- S2 - switch
- S3 - switch
- T1 - Trust transformer for Xenon lamps
- F1 - Fusible 250 V 500 MA
- LN1 - Neon lamp without resistor
- LP1 - Xenon Stroboscopic lamp
Components of auxiliary modules, resistors:
- R14 - 4700 OHM 1/4 W
- R15 - 1 KOHM 1/4 W
- R16 - 10 KOHM 1/4 W
- R17 - 10 KOHM 1/4 W
- R18 - 470 KOHM trimmer
- R19 - 470 OHM 1/4 W
- R20 - 100 KOHM 1/4 W
- R21 - 820 OHM 1/4 W
Components of auxiliary modules, capacitors:
- C11 - 100 NF Polyester
- C12 - 10 UF 25 V Electrolytic
- C13 - 220 PF ceramic
- C14 - 2,2 UF 25 V Electrolytic
- C15 - 100 UF 25 V Electrolytic
Other components of the auxiliary modules:
- IC2 - do.741
- Mic1 - Electret pre -amplified microphone capsule
- FD1 - fotodiodo BPW.34
- DL1 - diodo led
- TR2 - BC.237
- CONN1 - Battery connector, 25 male poles (for the PC LPT door)
Analysis of the wiring diagram of the xenon strobe
The voltage taken from the 230 Vac network, via R1 and R2, is straightened and duplicated from D1 and D2 and charges the capacitors C1 C2 C3 C4 with a total potential of about 600 V. This direct voltage is used to power the XENON lamp, which will emit a flash only if there is a very high voltage peak on its central terminal. This peak is provided by T1 when a small pulse on the GATE of SCR1 will immediately discharge C5 into T1.
The two resistors R1 and R2 must withstand a high current, due to the flashes (short circuits) of LP1. For the same reason, the 350 V 22 uF capacitors were placed in a two-to-two series instead of just one 10 uF capacitors. By not adopting these precautions, both the C1 C2 C3 C4 capacitors and the R1 and R2 resistors will soon be destroyed.
T1 must be a four-terminal XENO lamp ignition transformer. For some transformers, R8 must be eliminated.
Operation of the xenon strobe lamp
La vera novità di questo stroboscopio è comunque nell'oscillatore IC1, che permette di ottenere una vasta gamma di frequenze (lampi di luce). Con S2 chiuso la lampada lampeggerà lentamente (fino ad un impulso ogni tre secondi), con S2 aperto questa lampeggerà più velocemente (fino a 10 e più impulsi al secondo).
Un'altra novità di questo circuito è di poterlo collegare a qualsiasi apparato elettronico tramite OC1 (per disattivare l'oscillatore dello stroboscopio, aprire l'interruttore S3). Affinché si ottenga un lampo, bisognerà dare tensione (5-15 V) ai terminali 3 e 4 dello stroboscopio.
You can, for example, connect it to the auxiliary circuit that allows you to flash LP1 to the rhythm of music (with MIC1) or when FD1 is hit by a beam of light. The R18 trimmer of this interface serves to adjust the sensitivity.
E' possibile collegare questo stroboscopio anche ad un computer compatibile IBM, tramite la porta LPT1 (stampante) e il connettore CONN1. Si collegheranno i terminali 3 e 4 dello stroboscopio rispettivamente ai piedini 2 e 25 della presa LPT1 del computer.
PC connection of the xenon strobe
I programmed the xenon strobe lamp software in QuickBasic for DOS. The software allows you to set the flashes of the lamp according to the time, as well as to save and load all the flashing sequences.
Other programming examples
I programmi che seguono sono in linguaggio BASIC dell'epoca (GWBasic, QBasic, TBasic, ecc...):
10 DEF SEG=0: PN=PEEK(1032)+256*PEEK(1033): DEF SEG ' Indirizzo della porta LPT1 su variabile PN ... ... 100 OUT PN,255: OUT PN,0 ' Lampo dello stroboscopio
Line 10 prompts the computer to place LPT1 port memory. When a certain condition occurs in the program, the check will be sent to line 100, to get a flash. If the computer is too fast (it does not happen even with the 486), the line 100 will be replaced with the following:
100 OUT PN,255: FOR T=1 TO n: NEXT T: OUT PN,0
n is a number directly proportional to the speed of the computer.
This program flashes every S seconds (finally, press a key to exit):
10 S=1 ' Tempo che trascorre tra due lampi (secondi)
20 DEF SEG=0: PN=PEEK(1032)+256*PEEK(1033): DEF SEG
30 WHILE INKEY$=""
40 IF TIMER>=T+S THEN T=TIMER: OUT PN,255: OUT PN,0
50 WEND
This program flashes every time you press ENTER (press ESC to exit):
10 DEF SEG=0: PN=PEEK(1032)+256*PEEK(1033): DEF SEG
20 I$="": WHILE I$="": I$=INKEY$: WEND
30 IF I$=CHR$(13) THEN OUT PN,255: OUT PN,0
40 IF I$=CHR$(27) THEN END
50 GOTO 20
Il seguente programma emette lampi programmabili, modificando i byte (0 - non lampo ; 1 - lampo ; 2 - fine ; 3 - ripeti dall'inizio) separati da una virgola delle istruzioni DATA. Il tempo è dato da S (premere un tasto per uscire):
10 S=0.4 ' Tempo di lettura dati (secondi)
20 DEF SEG=0: PN=PEEK(1032)+256*PEEK(1033): DEF SEG
30 RESTORE: WHILE INKEY$=""
40 IF TIMER>=T+S THEN T=TIMER: READ X: ON X GOTO 70,60,30
50 WEND
60 END
70 OUT PN,255: OUT PN,0: GOTO 50
80 ' Dati (si possono inserire anche altre linee DATA)
90 DATA 1,0,1,1,1,0,1,0,1,1,1,1
100 DATA 1,0,1,2
Aggiungere ,2 o ,3 alla fine dell'ultimo DATA a seconda che il programma debba uscire o riprendere il ciclo da capo.
Project start: January 1994. State: for technical publication.