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G8MNY > TECH 24.12.25 18:52l 271 Lines 11812 Bytes #8 (0) @ WW
BID : 47812_GB7CIP
Subj: Autocaller with old Maplin kit
Path: JH4XSY<N3HYM<W9GM<VE3CGR<VE2PKT<VE3KPG<GB7CIP
Sent: 251224/0949Z @:GB7CIP.#32.GBR.EURO #:47812 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (Updated Mar 17)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
I had built a few of these Digital Record & Playback Modules kits from 1989 for
Contest calling, ATV repeater announcements and Commercial Radio use. So when
saw a new unbuilt kit at a junk sale I snapped it up. This new build came 2nd
in a construction contest.
Although with my IC735 HF rig there is a rear Aux socket with +13.8V, that has
all of the wanted signals, I use that for Demo station AF PA connection, so I
did not want use it here. I managed to used just the mic plug connection, the
max rating of the 8V @ 1A peak, incuding the radio! I found I had some
sensitive DIL package 12V 1K coil DIL reed changeover relays worked OK on 8V!
(but not all of them!)
LS
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ /Repeat\ rep /Mess\ ｳ ｳ IC735 ｳ
ｳ(Play) ｳ Delay ｳLEDｳ Time ｳｳ ｳ ｳ
ｳ \On Off/ \ / ｳ ｳ ｳ
ｳ ﾃﾄﾄｴMIC ｳ
ｳ(Mem ) run level ﾃﾄﾄｴPTT ｳ
ｳ LED ____ LED ﾃﾄﾄｴLS ｳ
ｳ /MIC \ ﾃﾄﾄｴ+8V ｳ
ｳ(Rec ) ｳSocketｳ (H/P) ﾃﾄﾄｴ0V ｳ
ｳ \____/ ｳ ｳ ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
Controls & Connection layout
THE KIT
It consists of an Electret Mic, 2 dual op-amps LF442 IC1 & 2, a dedicated A-D-A
sound 40pin IC3 UM5100, logic IC4 74HC133, 256K memory Ram 62256 IC5, & 5V reg.
IC3 has clock output that is used to make -ve rail for the opamps. For fixed
work, the ram can be an eprom, a seperate add on kit is an eprom programmer
(plugs into SK1) & banks of eproms can be use together for multi messaging etc.
P1 P2 P7 P8 P10 P12 P11 Mem Links
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ P1 Electret Mic
ｳ' ' ' ' ' ' '| | | ﾚﾄｿｳ P3 AF Output
ｳ LED ﾚﾄﾄﾄﾄﾄｿ| | | ｳ ｳｳ P10 Play
ｳRV1 TR1 TR2ｳ IC4 ｳﾚﾄﾄﾄﾄｿｳ ｳｳ P11 Record
ｳ ﾀﾄﾄﾄﾄﾄﾙｳ ｳｳSｳｳ P5 +8-14V in
ｳ ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿｳ ｳｳKｳｳ P7 +5V out
ｳﾚﾄｿ ｳ A-D-A ｳｳRAM ｳｳ1ｳｳ P2,4,5,6,9,12 0V
ｳｳ ｳ ｳ SOUND IC3 ｳｳIC5 ｳｳ ｳｳ ﾚﾄLED
ｳﾀﾄﾙ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙｳ ｳｳ ｳｳ Gain IC1 ___ Data TR1 ___
ｳ IC1 RV2 ｳ ｳｳ ｳｳ Micﾄﾁﾄｴ>ﾄｴ>ﾄｴA>DﾃﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄｴRAMｳ
ｳ ﾀﾄﾄﾄﾄﾙｳ ｳｳ ｳIC3ｳ Address ｳMEMｳ
ｳ ﾚﾄｿIC2 _ﾚﾄﾂﾄｿreg ｳ ｳｳ AFﾄﾄﾄ<ﾃﾄ<ﾃﾄｴA<DﾃﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄｴIC5ｳ
ｳ ｳ ｳ -ｳ ｳOｳ ｳ ｳｳ IC2 ｳ ｳstop ﾚﾄﾁﾄﾄｿ ﾀﾄﾄﾄﾙ
ｳ ﾀﾄﾙ. . . . ~ﾀﾄﾁﾄﾙ ﾀﾄﾙｳ play--------ｴOscﾃﾄTR2ﾄｴgateｳ ﾚﾄﾄﾄｿ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ rec---------ﾀﾄﾂﾄﾙ ﾀﾄﾄﾄﾄﾙ ｳregｳ
P3 P4 P6 P5 Speed IC4 ﾀﾄﾄﾄﾙ
The op-amps are used with the A-D-A input/output to generate the data, filter
and replay it. It is fairly flat 300Hz-3kHz with up to 40dB S/N, @ 10 seconds
message time. Up to 23 sec is usable, but quality is much reduced. For external
mic/AF use, I removed the mic's DC feed R.
BELL & WHISTLES
1/ Message time.
I extended the clock frequency preset RV2 to the front panel, to enable long or
short messages, and also variable speed on recorded items like CW.
2/ Status LEDs
I also extended the level LED & added a "4 Pulse" LED from a high order count
address line A12 on the programmer socket. This gives a simple end of message
warning.
S3ﾄﾄﾄ2R2ﾄﾄｴ>ﾃﾄｿ
// 0V
With the later repeat toggle latch (7/), I also added a "Repeat On" LED too.
3/ Battery backup.
To store the message on power off a battery backup is needed to power just the
Ram to > 2.4V. Cut the 5V track feeding the Ram & add..
1N4148
+5Vﾄｴ>ﾃﾄﾂﾄ330ﾄｿ
ｳ _ｳ_ 3x
Ram 28ﾄﾄﾙ _ﾜ_ 100mAH
_ﾜ_ Nicads
_ﾜ_
_____________ｳ___0v
4/ Second message Ram.
I piggy backed on a 2nd message RAM. I soldered the first directly into the PCB
with the Chip Select pin 20 track cut, and added a socket on top for the 2nd
RAM, also with CS pin isolated. I use a locking push switch to select the RAM.
+5Vﾄﾄﾄﾄﾂﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄｿ
100K 100K ｳ ﾚﾟﾟﾟﾟﾟｿ
RAM1 ｳ ｳ RAM2 ｳ ﾟﾟﾟﾟﾟﾟﾟ-20
20ﾄﾄﾄﾄｴ ﾃﾄﾄﾄﾄ20 ｳ =====ﾃﾟﾟﾟﾟﾟｴ======
ﾀo oﾙ ｳ cut PCB to pin 20
mem1 \ mem2 ｳ
ｳ 100K
Battery Save \ｳ_________ｳ By adding this NPN the power off battery
Earth e/ｳnpn backup current is reduced from mAs to <uA!
ﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ0v
5/ Record Rx.
This uses a non locking double pole changeover push button, to trigger record
mode with a one shot C and a change over from mic to Rx LS record, when record
button is held in.
Ham MIC>ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ>Rig
o Mic
AF in____________/REC
Module o ﾚﾄ100Kﾄ<Rx LS
(mic DC) ｳ Rx
(removed) ﾀﾄﾄ>Level
47K
Rec One shot o ｳ
Moduleﾄﾄﾄﾂﾄｴﾃﾄｿ__/REC ｳ
(pulse) ｳ10n ｳ o ｳ
ﾀﾄ1Mﾄﾙ ｳ ｳ
_________________ｳ____ｳ________0v
6/ Mon LS.
I added an old LM386 360mW amp and 8R LS as monitor. But used an AF diode gate
in front of it to mute LS, unless it was playing or recording off the Rx LS
line.
+ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾂﾄ<+8V
===22u 100K AF 100K ｳ
ﾁ ｳ Gate ｳ 3ｳ\6
Play AF>ﾄｴﾃﾄﾁﾄｴ>ﾃﾄﾂﾄｴ<ﾃﾄﾁﾄﾄｴﾃﾄｴLM\ 5 +220u FB _/ｳ
u1 ｳ u1 ｳ386'>ﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄｴﾃﾄﾄｴ ｳMon
Rx 100K ﾚﾄﾄｴ /8ﾄﾄｿ10u ===u1 ﾚｴ_ ｳLS
Rec >ﾄﾄﾄﾄﾄﾄｴ<ﾃﾄﾄﾄﾄｴ ｳ 2ｳ/ ｳ1 === ｳ ｳ \ｳ
ｳ ｳ 4ｳ ﾀpotﾙ+ 10R ｳ
Relay >ﾄﾄﾄﾄｴ<ﾃﾄﾄﾄﾄﾙ ﾄﾁﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄ0v
Play Pot 47K= preset Mon Vol
7/ Repeat timer.
I was going to use a 555 timer. But close investigation I saw an easy solution,
just an NPN and zener with a CR in front of it. Although this worked well, I
soon realised a toggle flip flop bistable was needed too, for ease of
operation.
Repeat On off with Delay control (a switched vol control pot)
ﾚﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾂo\__+8V
ｳ ===u1 ｳ
ｳ ﾃﾄﾄｿ ｳ
ｳ _ｳ_100K ｳ
Repeat_ｳ_ \_/ ｳ ｳ ﾚﾄ<Play button (earth)
ON =\ / ﾃﾄﾄﾁﾄｴ>ﾃﾄ)ﾄﾄﾄﾄﾄﾄﾂﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄ>Module Play (CMOS logic)
LED ﾄﾂﾄ ｳ ｳ ｳ
ｳ ｳ ﾚﾄｴ>ﾃﾄ)ﾄﾄﾄﾄﾄﾄ)ﾄ>Mic PTT stop _
1K ｳ ｳ 10K ｳ /|
ｳ ｳ ｳ ﾃﾄﾄｴ<ﾃﾄ)ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄ1M Delayﾄｿ
ﾃﾄ100Kﾄｴ ﾃﾄ22Kﾄｴ ｳ ｳ Control ｳ
ｳ \/ ｳ \ｳ ｳ / ｳ mic relay
T1 \ｳ_____/\____ｳ/ T2 T3 ﾃﾄｴ>ﾃﾄﾄﾂﾁﾄﾄﾄﾄﾄｴ>ﾃﾄﾄﾁﾄ33Kﾄﾄ<+8V on Rx
e/ｳ ｳ\e e/ｳ 5V' +ｳ 0V on play
ｳ Flip Flop ｳ ｳ ===22u
ﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ0v
On = repeat = Off Repeat Delay CR
The 33K sets the min delay to about 1 second Rx, and +1M to >60 seconds.
Turning the delay timer on (or rig power up), turns on T2 via u1. This ensures
the 22u can't charge up.
Pressing the Play button fires the module to play and also turn off T2 that
flips the toggle. T1 now on, lights the Repeat LED. T2 off lets 22u charge up
when the play has finished, from the 8V via the Mic relay coil. When > 5V, T3
is turned on initiating another play.
Pressing the Mic PTT puts a good earth via diode to T1's base turning it off,
and flipping the toggle into not repeat mode. So does the intial power on pulse
via u1 and diode with C charging 100K R.
RIG INTERFACING
A/ PTT
This was not straight forward! The kit does not have an ON PLAY line, so I
detected the fastest run clock A0 on S15 to generate a PTT line.
mic AF>ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄo
bead 10n \ﾄﾄﾄﾄﾄ>Rig mic
Module Play AF>ﾄﾄRFCﾄﾂﾄﾄｴﾃﾄ47kﾄﾄﾄﾄo mic
ｳ preset relay
Headphone relay<ﾄﾄﾙ play level
mic PTT>ﾄﾄﾂﾄﾄﾄﾄｴ<ﾃﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ ｳ
Kill ｳ +8V ｳ
Run <ﾄｴ>ﾃﾄﾙ ____ｳ____ ｳ
(TR1 Base 10k) ｳmic relayｳ ｳ
(Fed via diode) ﾀﾄﾄﾄﾄﾂﾄﾄﾄﾄﾙ o Play ｳ
ﾃﾄﾄﾄﾄﾄﾂﾄﾄﾄo<ﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄ>Rig PTT
WE Ram27ﾄﾄﾄﾄｴ<ﾃﾄｿ ｳ _ｳ_ Push held
0V record pulsesｳ ｳ /_\ in stops Tx
ｳ ｳ/ ｳ
S15ﾄﾄﾄﾄ27Kﾄｴ>ﾃﾄﾂﾁﾄ10Kﾄｴ>ﾃﾄｴBC182 ｳ
A0 Run +ｳ ｳ\e ｳ
clock 4u7=== ｳ ｳ
ﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄ0v
As I did not want the PTT or mic relay (mic powered from rig) operated on
record I used the 0V Write Enable pulses to discharge the 4u7 to defeat that
action.
B/ Headphones.
The last op-amp IC2 is just powerful enough to give playback headphone level
with cap changed and a NFB gain pot added, to the last unit gain amp. So I
added another reed relay changeover for the headphone feed.
ﾚﾄﾄ>Mic playback gain
ｳ
Headphone_ oﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄRFCﾄﾄ<Playback Module AF (modified louder Op-amp cct)
Relay\o bead
ﾀﾄ150Rﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ<Rig LS
100K
ｳ +8V
To Rec<ﾄﾄﾄﾄﾄﾄ>Rec level ____ｳ____
Button 47K pot ｳH/P relayｳ
ｳ ﾀﾄﾄﾄﾄﾂﾄﾄﾄﾄﾙ
ｳ ﾚﾄﾄﾄﾄｴ
ｳ u1ｳ ﾃﾄﾄﾄﾄﾄﾂﾄﾄﾄ> LS amp mute
ｳ === ｳ/ _ｳ_
S15ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ47Kﾄﾄ)ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄｴBC182 /_\
Run pulse ｳ ｳ\e ｳ
ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄ0v
The 150R in the headphone feed is selected to give suitable level from the
rig's LS line.
WIRING UP
With all these mods the unit is quite complex, but I managed it with just 1
additional vero PCB and loads of coloured wiring, CAD documenting it as I went.
One thing I did miss was the effect of the LS magnet on the nearby reed relays,
once the lid was on! A tin can cover glued/soldered over the magnet was needed!
CALIBRATION
There are several pots in the system, a bit of a round robin to get right
straight away, some need to be set first, before the others are adjusted.
1/ Set the original mic in gain RV1, to "just distort" if shouting into the mic
(Level LED flashes brightly).
2/ Set added Playout gain level on IC2, to give adequate headphone level.
3/ Set Playout level mic feeding preset to give same Tx level as the live mic.
4/ Re check 1 2 & 3 for best results.
5/ Set Rx LS vol to typical level on a Rx signal. Set Rx Rec pot for same
flashing LED level as with mic record.
6/ Set Mon LS play level to a comfortable background check level.
ERGONOMIC CONTROLS
In use the controls make it very easy to use. With headphones on you can hear
the Rx, pre-recorded messages, Tx or not depending on keeping the play button
pressed. A stab of the record button, records the mic for the 4 LED flashes, or
keeping the button pressed, it records the Rx AF, were the rig Volume control
setting the level all heard in the headphones.
Without the headphones you just hear playouts on the LS. but not when recording
the mic. Pressing the mic PTT kills the player & the repeat toggle.
Recordings should be made with little/no AGC action & "repeat" set to OFF!
Replay of Rx recordings come over best if the rig's mic processing is "OFF"!
See my other tech bul on "PA instability in ICOM IC735" & "IC 735 No RF Output
Fault"
Why Don' U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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